{"id":5204,"date":"2021-09-27T11:04:04","date_gmt":"2021-09-27T11:04:04","guid":{"rendered":"https:\/\/www.mybiosource.com\/learn\/?p=5204"},"modified":"2024-04-04T02:17:54","modified_gmt":"2024-04-04T02:17:54","slug":"what-is-dna-everything-you-need-to-know","status":"publish","type":"post","link":"https:\/\/www.mybiosource.com\/learn\/what-is-dna\/","title":{"rendered":"What Is DNA? Everything You Need To Know"},"content":{"rendered":"<table style=\"background-color: #ebebde;\">\n<tbody>\n<tr>\n<td style=\"width: 458px;\">\n<h2 style=\"padding-left: 80px;\"><strong><u>Table of Contents<\/u><\/strong><\/h2>\n<p><a href=\"#1\"><strong>1. Introduction<\/strong><\/a><br \/>\nA. Historical contributions to science<br \/>\nB. Modern advances in medicine<br \/>\nC. Importance of GoFR<br \/>\nD. Benefits and concerns of GoFR<br \/>\n<a href=\"#2\"><strong>2. What is Gain of Function research?<\/strong><\/a><br \/>\n<a href=\"#3\"><strong>3. What is the purpose of Gain of Function research?<\/strong><\/a><br \/>\nA. How GoFR allows for better understanding of key symptoms and the development of effective preventatives<br \/>\nB. GoFR and a Sustainable Future<br \/>\nC. Political Concerns and Funding<br \/>\n<a href=\"#4\"><strong>4. Risks of Gain of Function research<\/strong><\/a><br \/>\n<a href=\"#5\"><strong>5. Conclusion<\/strong><\/a><\/p>\n<p>&nbsp;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr \/>\n<h2 style=\"padding-left: 40px;\">Introduction<\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-5207\" src=\"https:\/\/www.mybiosource.com\/learn\/wp-content\/uploads\/2021\/09\/Introduction-1.jpg\" alt=\"A scientist studying DNA \" width=\"1000\" height=\"400\" srcset=\"https:\/\/www.mybiosource.com\/learn\/wp-content\/uploads\/2021\/09\/Introduction-1.jpg 1000w, https:\/\/www.mybiosource.com\/learn\/wp-content\/uploads\/2021\/09\/Introduction-1-980x392.jpg 980w, https:\/\/www.mybiosource.com\/learn\/wp-content\/uploads\/2021\/09\/Introduction-1-480x192.jpg 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) and (max-width: 980px) 980px, (min-width: 981px) 1000px, 100vw\" \/><\/p>\n<p><span style=\"font-weight: 400;\">If you ever saw Jurassic Park, you know that DNA is an important part of any animal&#8217;s biological makeup. DNA is more important than you know, and more important than we realize as we go about our daily lives.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">We can get DNA tests to test for parentage, lineage, and to look back and find our ancestors and where our family lines originated from. However, DNA does much more than just tell us?\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">DNA is a set of instructions that are necessary to live. Coding within our DNA provides directions on how to make proteins that are necessary for our growth, development, and overall health.<\/span><\/p>\n<p id=\"1\">What is DNA?<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-5208\" src=\"https:\/\/www.mybiosource.com\/learn\/wp-content\/uploads\/2021\/09\/What-Is-DNA.jpg\" alt=\"a female scientist studying DNA\" width=\"1000\" height=\"401\" srcset=\"https:\/\/www.mybiosource.com\/learn\/wp-content\/uploads\/2021\/09\/What-Is-DNA.jpg 1000w, https:\/\/www.mybiosource.com\/learn\/wp-content\/uploads\/2021\/09\/What-Is-DNA-980x393.jpg 980w, https:\/\/www.mybiosource.com\/learn\/wp-content\/uploads\/2021\/09\/What-Is-DNA-480x192.jpg 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) and (max-width: 980px) 980px, (min-width: 981px) 1000px, 100vw\" \/><\/p>\n<p><span style=\"font-weight: 400;\">DNA is an acronym for deoxyribonucleic acid. It is created by a variety of building blocks in our biology known as <\/span><a href=\"https:\/\/www.genome.gov\/genetics-glossary\/Nucleotide\" target=\"_blank\" rel=\"noopener nofollow\"><span style=\"font-weight: 400;\">nucleotides<\/span><\/a><span style=\"font-weight: 400;\">. DNA is vitally important as a molecule, for all organisms, not just people and animals, plants have DNA too! DNA contains the hereditary material from our ancestors, and our genetics, it is what makes us unique.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Back in the 40s, Biologists struggled to accept that DNA is the genetic material of organisms, simply because it is much simpler in its chemistry than you might expect. DNA was known to be a long polymer which is composed of only a simple four types of subunits, which resemble each other chemically.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Before we carry on, let\u2019s have a look at these four <span id=\"urn:enhancement-7d18475b-7ab1-4da7-a277-0e5607acb0eb\" class=\"textannotation disambiguated wl-thing\">chemical<\/span> bases that make DNA.\u00a0<\/span><\/p>\n<h3><strong>DNA Is Stored As A Code Made Up of Four Chemical Bases\u00a0<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Information inside DNA is stored as code which is made up from four <span id=\"urn:enhancement-8bde0cc4-aaa0-4d4b-b8b6-8cd6b9dd149b\" class=\"textannotation disambiguated wl-thing\">chemical<\/span> bases, these are; <span id=\"urn:enhancement-452ef352-d86d-494d-8837-8f0178ae61db\" class=\"textannotation disambiguated wl-thing\">adenine<\/span> (A), <span id=\"urn:enhancement-55e3ecad-ea6d-435a-8034-77efe74497ab\" class=\"textannotation disambiguated wl-thing\">guanine<\/span> (G), <span id=\"urn:enhancement-3b68bc3d-91ac-4f9a-8404-0538287dc568\" class=\"textannotation disambiguated wl-thing\">cytosine<\/span> (C), and <span id=\"urn:enhancement-21d65bee-210f-420e-b73b-02b5228efc8a\" class=\"textannotation disambiguated wl-thing\">thymine<\/span> (T). Human DNA is made up of around 3 billion vases, and more than 99% of these bases are the same in all humans. The order and sequencing of these babes are what determines the information available for building and maintaining a living organism, similar to how the letters in the alphabet are morphed into different words and sentences that we then understand.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><span id=\"urn:enhancement-0a1a30fe-8958-4df8-8291-708393ca1837\" class=\"textannotation disambiguated wl-creative-work\">DNA bases<\/span> will pair up with each other, A will pair with T, and C with G in order to form the base pairs. Each base will then also be attached to a sugar molecule and a <span id=\"urn:enhancement-15a46f75-c2d1-452d-ad39-6f4ec8ff7c64\" class=\"textannotation disambiguated wl-thing\">phosphate<\/span> molecule. Combines a base pair, a sugar molecule, and a <span id=\"urn:enhancement-0cb5c4fe-4e93-495b-9b5f-55ac4c571748\" class=\"textannotation disambiguated wl-thing\">phosphate<\/span> molecule are called a <span id=\"urn:enhancement-e63be423-f51b-4d6b-99a7-020efc188d88\" class=\"textannotation disambiguated wl-thing\">nucleotide<\/span>.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><span id=\"urn:enhancement-41edb713-c425-4b60-845f-4a986d98553a\" class=\"textannotation disambiguated wl-thing\">Nucleotides<\/span> are then arranged in two long strands that form a <span id=\"urn:enhancement-82c43031-04c1-4cdc-8329-ea9028504873\" class=\"textannotation disambiguated wl-thing\">double helix<\/span>, which is kind of like a ladder, with base pairs forming the rungs of the ladder, and the sugar and <span id=\"urn:enhancement-2a747c40-dfae-4d28-ab5f-eeb02d3f754a\" class=\"textannotation disambiguated wl-thing\">phosphate<\/span> molecules forming vertical side pieces of the ladder.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">One epic thing about DNA is that it can replicate or produce copies of itself. Each strand of DNA in a <span id=\"urn:enhancement-42c99c3a-3975-490c-948e-e3063add0d22\" class=\"textannotation disambiguated wl-thing\">double helix<\/span> can serve as a pattern for duplicating the sequence of bases.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Let\u2019s learn a little more about each of the four <span id=\"urn:enhancement-ce5ef97e-067c-46f8-a434-cf5fc80e7a7e\" class=\"textannotation disambiguated wl-thing\">chemical<\/span> bases that make up DNA.\u00a0<\/span><\/p>\n<h4><b>Adenine (A)\u00a0<\/b><\/h4>\n<p><a href=\"https:\/\/www.cancer.gov\/publications\/dictionaries\/cancer-terms\/def\/adenine\" target=\"_blank\" rel=\"noopener nofollow\"><span style=\"font-weight: 400;\">Adenine<\/span><\/a><span style=\"font-weight: 400;\"> is a nucleobase in the nucleic acid of DNA. <span id=\"urn:enhancement-72f0f5d5-4d98-4937-a57f-864904052866\" class=\"textannotation disambiguated wl-thing\">Adenine<\/span> has roles in protein synthesis and as a <span id=\"urn:enhancement-24a41a31-fd75-4990-8d31-15b8df306566\" class=\"textannotation disambiguated wl-thing\">chemical<\/span> component of <span id=\"urn:enhancement-c7291c5b-36ea-422a-9954-7a9a97eadc8b\" class=\"textannotation disambiguated wl-creative-work\">RNA<\/span> and DNA. When <span id=\"urn:enhancement-121d24d2-1cdf-4334-96cb-4cda3bebafe3\" class=\"textannotation disambiguated wl-thing\">Adenine<\/span> is connected into DNA, a covalent bond is formed between <span id=\"urn:enhancement-f5067337-9b3b-454f-8e56-7ad30f7490f5\" class=\"textannotation disambiguated wl-thing\">deoxyribose<\/span> sugar and nitrogen.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><span id=\"urn:enhancement-fd5203ed-b2c3-4edb-ac2f-3872c9426e77\" class=\"textannotation disambiguated wl-thing\">Adenine<\/span> is one of the two <span id=\"urn:enhancement-d356d24f-62e5-4e77-843b-78f1efa728c8\" class=\"textannotation disambiguated wl-thing\">purine<\/span> nucleases that is used in the formation of <span id=\"urn:enhancement-d0228ede-f04e-4646-a34c-918e684b079c\" class=\"textannotation disambiguated wl-thing\">nucleotides<\/span> of the nucleic acids. It binds to <span id=\"urn:enhancement-a6c22abe-405d-4228-96d7-82e67fde8bf7\" class=\"textannotation disambiguated wl-thing\">thymine<\/span> via two hydrogen bonds and assists in stabilizing the nucleic acid structures.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><span id=\"urn:enhancement-f1943edc-b2a2-4485-9b1a-0ab168aac736\" class=\"textannotation disambiguated wl-thing\">Adenine<\/span> forms adenosine, which is a nucleoside, when it is attracted to ribose, and deoxyadenosine when it is attached to <span id=\"urn:enhancement-31a8c504-344b-433b-bcf1-09d8aeccdea6\" class=\"textannotation disambiguated wl-thing\">deoxyribose<\/span>.\u00a0\u00a0<\/span><\/p>\n<h4><b>Guanine (G)<\/b><\/h4>\n<p><span style=\"font-weight: 400;\"><span id=\"urn:enhancement-9a523cfc-98e6-4cb5-9fa0-7cc7afbf43b3\" class=\"textannotation disambiguated wl-thing\">Guanine<\/span> has long been known to aggregate in solution, in the nucleoside, oligonucleotide, and polynucleotide forms. It is a <span id=\"urn:enhancement-416631d3-5b42-48c9-bac0-5754b655ce36\" class=\"textannotation disambiguated wl-thing\">purine<\/span> nucleobase, oligonucleotide. <\/span><a href=\"https:\/\/www.genome.gov\/genetics-glossary\/guanine#:~:text=Guanine%20(G)%20is%20one%20of,encodes%20the%20cell's%20genetic%20instructions.\" target=\"_blank\" rel=\"noopener nofollow\"><span style=\"font-weight: 400;\">Guanine<\/span><\/a><span style=\"font-weight: 400;\"> can be distinguished from <span id=\"urn:enhancement-dcfd7963-844d-41d7-aa80-493b23544ba7\" class=\"textannotation disambiguated wl-thing\">adenine<\/span> by its amine group. <span id=\"urn:enhancement-31e82e96-ea74-4018-ad1c-7f3c18b681d1\" class=\"textannotation disambiguated wl-thing\">Guanine<\/span> complementary pairs with <span id=\"urn:enhancement-cba98026-9aee-441b-938d-fcf0e3c493bd\" class=\"textannotation disambiguated wl-thing\">cytosine<\/span> via three hydrogen bonds in <span id=\"urn:enhancement-860b38a0-c914-4458-83ae-9d102176188e\" class=\"textannotation disambiguated wl-creative-work\">RNA<\/span> and DNA molecules. This is different from <span id=\"urn:enhancement-9fe7169c-4a5e-4d32-b74a-18f980543426\" class=\"textannotation disambiguated wl-thing\">Adenine<\/span>, which bonds to <span id=\"urn:enhancement-8e3c799b-96eb-4913-80f0-8f9cedd9045c\" class=\"textannotation disambiguated wl-thing\">thymine<\/span> in DNA via two hydrogen bonds.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Both <span id=\"urn:enhancement-21d27821-e4f8-44c5-81da-32a0f8f51159\" class=\"textannotation disambiguated wl-thing\">guanine<\/span> and <span id=\"urn:enhancement-72c559a6-9af6-4943-bedd-538b3c9b6813\" class=\"textannotation disambiguated wl-thing\">adenine<\/span> are derived from the <span id=\"urn:enhancement-fa354756-61bd-4e9a-835a-de091eaf02d5\" class=\"textannotation disambiguated wl-thing\">nucleotide<\/span> <span id=\"urn:enhancement-41e8be2f-a84c-4b67-816e-ff7927bcdc47\" class=\"textannotation disambiguated wl-thing\">inosine monophosphate<\/span>, as purines are synthesized as ribonucleotides as not as free nucleobases.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><span id=\"urn:enhancement-acc374bd-47fc-4d9d-af43-05215a1838a3\" class=\"textannotation disambiguated wl-thing\">Guanine<\/span> has been associated with camouflage, display, and vision. It has been found to occur in iridocytes which are the specialized skin cells of fish.\u00a0<\/span><\/p>\n<h4><b>Cytosine (C)<\/b><\/h4>\n<p><span style=\"font-weight: 400;\"><span id=\"urn:enhancement-df7d61c8-6703-44dd-8007-77f14107940a\" class=\"textannotation disambiguated wl-thing\">Cytosine<\/span> bonds to <span id=\"urn:enhancement-48596ce3-f923-4753-9e68-ab018654d133\" class=\"textannotation disambiguated wl-thing\">guanine<\/span> in DNA. In a <span id=\"urn:enhancement-f78833a8-b7d5-42d3-a5bf-67c85173fbb2\" class=\"textannotation disambiguated wl-creative-work\">DNA molecule<\/span>, <span id=\"urn:enhancement-c5197ae2-5dfb-4434-b0e7-51ea90a076f9\" class=\"textannotation disambiguated wl-thing\">cytosine<\/span> bases located on one stand form a <span id=\"urn:enhancement-1f9d82d7-aa43-4641-952c-109280b8ce7f\" class=\"textannotation disambiguated wl-thing\">chemical<\/span> bond with the <span id=\"urn:enhancement-cbb18539-a7b5-481b-9008-238e6a285e0b\" class=\"textannotation disambiguated wl-thing\">guanine<\/span> bases on the opposing stand.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><span id=\"urn:enhancement-6c68865b-cea9-41ef-ad1b-2b6f9b6e099a\" class=\"textannotation disambiguated wl-thing\">Guanine<\/span> and <span id=\"urn:enhancement-0d351a69-e3f0-408e-bcb0-72c0a4d46dc7\" class=\"textannotation disambiguated wl-thing\">cytosine<\/span> bond together in DNA, forming three hydrogen bonds. <\/span><a href=\"https:\/\/en.wikipedia.org\/wiki\/Cytosine\" target=\"_blank\" rel=\"noopener nofollow\"><span style=\"font-weight: 400;\">Cytosine<\/span><\/a><span style=\"font-weight: 400;\"> is relatively unstable and can be converted into <span id=\"urn:enhancement-589e6745-4118-4cc9-a4dc-225fe83c99ef\" class=\"textannotation disambiguated wl-thing\">uracil<\/span>, which can be corrected by <span id=\"urn:enhancement-2e18bad2-6b21-4323-9d50-06c636e1a71e\" class=\"textannotation disambiguated wl-creative-work\">DNA repair<\/span> systems such as the use of the enzyme <span id=\"urn:enhancement-95f532c7-ca10-4bd8-9631-0eb169176f89\" class=\"textannotation disambiguated wl-thing\">uracil<\/span> glycosylase. If this is not repaired, it can actually lead to a point mutation.\u00a0<\/span><\/p>\n<h4><strong>Thymine (T)\u00a0<\/strong><\/h4>\n<p><span style=\"font-weight: 400;\"><span id=\"urn:enhancement-ce474234-10fe-4f34-af3c-e6ee3f4a4e6c\" class=\"textannotation disambiguated wl-thing\">Thymine<\/span> is the final of the four nitrogenous nucleobases that form the basic building blocks of deoxyribonucleic acid. It pairs with <span id=\"urn:enhancement-05bc93f6-82c1-41a5-a050-a7912afec030\" class=\"textannotation disambiguated wl-thing\">adenine<\/span>, and they are joined together by two hydrogen bonds which stabilize the nucleic acid structures within DNA. When they are stacked with the other base pair; <span id=\"urn:enhancement-8536ff66-6ede-42a3-a599-dbf2008178a1\" class=\"textannotation disambiguated wl-thing\">guanine<\/span> and <span id=\"urn:enhancement-07dbb8b7-b87f-4dd9-97ad-2a480a2d1ea9\" class=\"textannotation disambiguated wl-thing\">cytosine<\/span>, the helical structure we know as DNA is formed.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">In the structure of <span id=\"urn:enhancement-bd7ec6d2-ccbb-4fba-8c61-97c12587bc7c\" class=\"textannotation disambiguated wl-creative-work\">RNA<\/span>, <span id=\"urn:enhancement-8e84fb5c-4e54-48d1-9c38-5290d5813058\" class=\"textannotation disambiguated wl-thing\">thymine<\/span> is actually replaced by the <span id=\"urn:enhancement-5f7613d4-bd78-4d20-a95c-f00fb1d5ad26\" class=\"textannotation disambiguated wl-thing\">uracil<\/span> nucleobase. The alternative name of <span id=\"urn:enhancement-c11cb304-27ec-47a9-b8b4-6269ea07f904\" class=\"textannotation disambiguated wl-thing\">thymine<\/span> is <span id=\"urn:enhancement-38cb27c4-e5bc-492a-aefc-09512ce5bd57\" class=\"textannotation disambiguated wl-thing\">5-methyluracil<\/span>, suggesting that <span id=\"urn:enhancement-0884d387-082c-4e5c-b028-b54d49fbfc4a\" class=\"textannotation disambiguated wl-thing\">thymine<\/span> can be derived by the methylation of <span id=\"urn:enhancement-642c2795-0572-4012-aeac-c000704c87bc\" class=\"textannotation disambiguated wl-thing\">uracil<\/span> at the 5th carbon.\u00a0<\/span><\/p>\n<p><a href=\"https:\/\/www.sciencedirect.com\/topics\/neuroscience\/thymine\" target=\"_blank\" rel=\"noopener nofollow\"><span style=\"font-weight: 400;\">Thymine<\/span><\/a><span style=\"font-weight: 400;\"> is just as guilty of causing mutations as other nucleobases. When it is exposed to ultraviolet radiation such as light from the sun, covalent bonds are formed between adjacent <span id=\"urn:enhancement-20cb1274-44c2-4e91-9c1e-04684f5aba14\" class=\"textannotation disambiguated wl-thing\">thymine<\/span> molecules on the same <span id=\"urn:enhancement-81108a2e-d1f4-421d-bcea-9000271a15e7\" class=\"textannotation disambiguated wl-creative-work\">DNA strand<\/span>, which create <span id=\"urn:enhancement-ad5ab67f-299e-4fb4-aea9-63cd6cad0d9d\" class=\"textannotation disambiguated wl-thing\">thymine<\/span> dimers. This is a process that causes damage and causes the DNA to form kinks, and inhibits the usual <span id=\"urn:enhancement-3fba2269-4f80-4ce8-8814-a26379196604\" class=\"textannotation disambiguated wl-thing\">function<\/span> of the DNA, which cannot then be replicated or transcribed. However, most cells are able to repair damaged DNA.\u00a0<\/span><\/p>\n<h3><strong>What Does DNA Look Like?<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Back on April 25th 1952 Francis Crick and James Watson published their famous article <\/span><a href=\"https:\/\/www.pbs.org\/wgbh\/evolution\/library\/06\/3\/l_063_01.html#:~:text=Taken%20in%201952%2C%20this%20image,shape%20of%20the%20DNA%20molecule.\" target=\"_blank\" rel=\"noopener nofollow\"><span style=\"font-weight: 400;\">which showed DNA\u2019s shape<\/span><\/a><span style=\"font-weight: 400;\"> to be a <span id=\"urn:enhancement-c2bef4ff-4790-4022-bcb9-6a13134ee972\" class=\"textannotation disambiguated wl-thing\">double helix<\/span>. They were unable to see DNA directly, as it is far too miniscule for that, however they came to their conclusion based on calculations and X-ray <span id=\"urn:enhancement-7d1d0310-a6bb-4779-aaf2-48e30663f28a\" class=\"textannotation disambiguated wl-thing\">diffraction<\/span> images. The famous photo-51 gave them crucial information.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Ever since then the <span id=\"urn:enhancement-7ba5f980-f92e-4d7c-8637-c76a1baf83e0\" class=\"textannotation disambiguated wl-thing\">double helix<\/span> structure has become the iconic image of DNA, in logos and stock images, as well as in Jurassic Park of course. It&#8217;s even been added to the official list of emojis you can use. In terms of that, the announcement of the DNA emoji annoyed scientists, not because it was turned into an emoji, but because the helix was twisted in the wrong direction, however, they fixed this issue before the emoji was officially released to the world.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">It&#8217;s not surprising of course, that many artistic interpretations of the DNA <span id=\"urn:enhancement-89bd54cf-0780-437e-aa41-4282985945a1\" class=\"textannotation disambiguated wl-thing\">double helix<\/span> do not claim to be fully scientifically accurate of course, and they will often let the helix turn in whichever way looks best. However, in our bodies, and in the bodies of every other living thing on earth, from monkeys to dolphins, to elephants to that large oak tree in the local park, the characteristic DNA helix will only ever have a right-handed turn.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The kind of DNA helix we can see are only models, you cannot see real DNA with the naked eye, have you ever seen some helix spirals pop out when you pricked your finger and bled? No, of course not.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">You couldn\u2019t even see DNA with a microscope. The only reason we are aware that DNA exists in the shape of a <span id=\"urn:enhancement-f4be4fd5-9a2d-4f1f-80ba-075581d10387\" class=\"textannotation disambiguated wl-thing\">double helix<\/span> is because it is the only shape that can explain the X-ray <span id=\"urn:enhancement-9c0f4abf-d2db-4fa0-9314-c8f24e8e7bcb\" class=\"textannotation disambiguated wl-thing\">diffraction<\/span> patterns that it forms. We know this, not only from Rosalind Franklin&#8217;s image, but also from many other images that have been taken over the years by a whole multitude of other scientists. It is simply not just something you can clearly see under a microscope, as it is just so tiny!\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">A <span id=\"urn:enhancement-5a999aa1-505a-4cbc-acf8-88bff60e2c6b\" class=\"textannotation disambiguated wl-thing\">double helix<\/span> strand is a tiny 2 nanometers wide, your finger is a good 5 million times wider than that, it&#8217;s so incredibly small, but so absolutely vital to existence.\u00a0\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">You might be able to see DNA in a few instances, however, one would be if you had a lot of DNA in one test tube. High school projects and science fairs will often involve <span id=\"urn:enhancement-e443482c-c0b4-464b-a10e-64c5ecc780da\" class=\"textannotation disambiguated wl-thing\">DNA extraction<\/span> from vegetables and fruits. They remove the DNA from the plant&#8217;s cells and place it in alcohol. Here you will be able to see it as a kind of snotty and white blob in the tube. This is not all that far from the kind of experiment molecular biologists will regularly do in their laboratories, however, they do it at a much, much smaller scale to analyze the DNA samples.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">There is one more well known DNA shape, the <\/span><a href=\"https:\/\/www.britannica.com\/science\/chromosome\" target=\"_blank\" rel=\"noopener nofollow\"><span style=\"font-weight: 400;\">chromosome<\/span><\/a><span style=\"font-weight: 400;\">. One individual chromosome contains several million base pairs of DNA, covering a few hundred genes on average. With chromosomes, what you are actually seeing is a very tightly wound long double strand of DNA. Although, it does not always exist in this shape in your cells, it will only look this way during <span id=\"urn:enhancement-ea546cbf-2dc9-4342-acb5-711a14bc7839\" class=\"textannotation disambiguated wl-thing\">cell division<\/span>, however, this bunched up shape we refer to is visible under a microscope.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">If you are lucky enough to have access to an <span id=\"urn:enhancement-3d638943-bee2-4a24-90f2-63ed1508540b\" class=\"textannotation disambiguated wl-thing\">electron microscope<\/span>, you could zoom in even more, and at this resolution you may be able to see a strand of DNA inside a cell. However, there still is not a huge amount of detail at this level of scope. The best way that you could visualize an individual helix would be to create a model based on indirect images, perhaps from <span id=\"urn:enhancement-60a3f8ea-54ea-4837-9540-f7244b2c8ee0\" class=\"textannotation disambiguated wl-creative-work\">X-ray crystallography<\/span>, or nuclear magnetic resonance spectroscopy. The resulting images would not be a true image of one single piece of DNA, but an average image of several molecules.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Then, in 2014, Pyne and some of her colleagues were able to look at the structure of a DNA helix using a technique they called Atomic Force Microscopy. Using this method they were able to see details that were not visible in the past, all the way to the characteristic grooves in the helix, both major grooves, and minor ones too. They started to get some structure to the image of a DNA helix. It was more detailed than most non-averaged DNA images, however, even at this level you still were not able to see the individual base pairs that make each piece of DNA unique. No microscope would see it, so usually the genetic code is simplified as simply, a code.\u00a0<\/span><\/p>\n<p id=\"2\">Where is DNA Found?<\/p>\n<p><span style=\"font-weight: 400;\">DNA is not found just floating aimlessly around in the cells, a vast majority of DNA is stored in a small compartment inside cells called the nucleus. A small bit of DNA can also be found in another compartment of the \u00a0 known as the mitochondrion.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Every human cell has around six picograms of DNA, this is actually small in quantity, and is much tinier than a grain of rice.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The location of DNA depends on the organism, in a bacterium or archaebacterium you would find all the DNA is stored in the cytoplasm of the cell. In terms of bacteria or archaebacteriums (prokaryotes) then the cytoplasm is basically everything inside a cell.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">However, for eukaryotes, this means plants, animals, fungus, or a variety of microscopic beasties which are not prokaryotes. If you are reading this, you\u2019re most likely human and thus a eukaryote. While these beings have cytoplasm, they also have membrane-bound organelles which act as small compartments where different activities can take place within the cell. A majority of a eukaryote\u2019s DNA is stored in just one of these organelles, called the nucleus. A small bit of <\/span><a href=\"https:\/\/www.britannica.com\/science\/eukaryote#:~:text=Eukaryote%2C%20any%20cell%20or%20organism,the%20hereditary%20material)%20are%20located.\" target=\"_blank\" rel=\"noopener nofollow\"><span style=\"font-weight: 400;\">eukaryotic<\/span><\/a><span style=\"font-weight: 400;\"> DNA can also be found in two other organelles; the mitochondria, which is relevant for organisms which can photosynthesize, and also chloroplasts.\u00a0<\/span><\/p>\n<p><a href=\"https:\/\/en.wikipedia.org\/wiki\/Nuclear_DNA#:~:text=Nuclear%20DNA%20(nDNA)%2C%20or,nucleus%20of%20a%20eukaryotic%20organism.&amp;text=It%20adheres%20to%20Mendelian%20inheritance,mother)%20as%20in%20mitochondrial%20DNA.\" target=\"_blank\" rel=\"noopener nofollow\"><span style=\"font-weight: 400;\">Nuclear DNA<\/span><\/a><span style=\"font-weight: 400;\"> is organized into linear molecules, which we know as chromosomes. The size and number of chromosomes varies between species. A fruit fly will have only 4 chromosomes, whereas a toad will have 18. A majority of humans will have 46 chromosomes, 23 pairs. Exceptions to this can include mature red blood cells that contain no DNA, as well as sperm and egg cells which have 23 unpaired chromosomes, (you can guess why, right)?<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Chromosomes are made up of a single molecule of DNA wrapped around a small, spool-like protein called a histone. The wrapping of this DNA around a histone is very important, otherwise a majority of DNA molecules would not fit inside of cells.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">In humans, the total length of DNA in one cell, if you were to unwind it and stretch it end to end, would be about 6ft long. But that amount of DNA has to fit, tightly packed, into the nucleus of a cell, which has only a miniscule diameter of five to ten <\/span><span style=\"font-weight: 400;\">\u03bcm. The best way to imagine this is to think of packing 24 miles of a thin piece of sewing thread into a tennis ball. Which sounds physically impossible, but somehow science manages to make it happen with our DNA.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">So, we know that DNA can be found in three organelles; the nucleus, mitochondrion, and the chloroplast. Only eukaryotes have a nucleus, which is a large structure surrounded by a membrane. <span id=\"urn:enhancement-953fddeb-47b3-4433-9230-a8f047a6c2ee\" class=\"textannotation disambiguated wl-thing\">Nuclear DNA<\/span> comes in from the form of long, and linear pieces of DNA which we know as chromosomes. Humans have an amazing six feet of\u00a0 DNA, but these six feet of DNA are usually spread out over 46 chromosomes.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">A majority of eukaryotes also have mitochondria as well, which are seen as the energy powerhouse of the cell. In this the DNA is known as mitochondrial DNA or mtDNA, and instead of being linear, it is circular. This usually only has a small fraction of the DNA that you could expect to find in the nucleus.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Only plants and eukaryotic algae have chloroplasts. These can capture sunlight and turn it into energy in the process we know as photosynthesis. In a chloroplast, the DNA is called chloroplast DNA or cpDNA, and like the DNA you might find in mitochondria, it is circular.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">DNA is packed tightly into the nucleus of our cells as chromosomes. Humans are diploid organisms, meaning that they have two copies of every chromosome- one from each parent.<\/span><\/p>\n<p id=\"3\">What Does DNA Do?<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-5209\" src=\"https:\/\/www.mybiosource.com\/learn\/wp-content\/uploads\/2021\/09\/What-Does-DNA-Do.jpg\" alt=\"What Does DNA Do\" width=\"1000\" height=\"401\" srcset=\"https:\/\/www.mybiosource.com\/learn\/wp-content\/uploads\/2021\/09\/What-Does-DNA-Do.jpg 1000w, https:\/\/www.mybiosource.com\/learn\/wp-content\/uploads\/2021\/09\/What-Does-DNA-Do-980x393.jpg 980w, https:\/\/www.mybiosource.com\/learn\/wp-content\/uploads\/2021\/09\/What-Does-DNA-Do-480x192.jpg 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) and (max-width: 980px) 980px, (min-width: 981px) 1000px, 100vw\" \/><\/p>\n<p><span style=\"font-weight: 400;\">Understanding the basics of DNA, what it looks like, and where you can find it is great. However, what DNA does is more important than this. DNA is something that literally affects how we live, who we are, and our physical traits. Mutations in DNA can create illnesses or unique features that stand us out from the crowd, so what DNA does is very important, and it is more than worth knowing.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">DNA contains the instructions needed for an organism to develop, survive and reproduce, basically, DNA is the key to existence. In order to do this, DNA sequences require to be converted into messages that are then used to produce proteins, which are the complex and skilled molecules that do a vast majority of the work inside our bodies.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Every <span id=\"urn:enhancement-2b7ac5af-33bf-4688-80d7-28d56db837af\" class=\"textannotation disambiguated wl-thing\">DNA sequence<\/span> that has instructions on how to make a protein is known as a <span id=\"urn:enhancement-aa06bc95-5a8e-4a15-a591-3313ecd15945\" class=\"textannotation disambiguated wl-creative-work\">gene<\/span>. The size of these genes can vary greatly, ranging from around 1,000 bases, to 1 million bases in humans. But genes only make up around one percent of the whole <span id=\"urn:enhancement-67d2661d-2be7-42b2-b73f-7b43bfe87ae1\" class=\"textannotation disambiguated wl-thing\">DNA sequence<\/span>. Sequences outside of this tiny one percent are involved in regulating when, how and how much of a protein is made. In this sense, your body is a factory, the DNA is the overseers and supervisors who give instructions and information on the creation of proteins.\u00a0\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">DNA instructions are handed to the enzymes to read the information in a <span id=\"urn:enhancement-e46f39b6-56b0-43b8-93e4-76e158e8c5c8\" class=\"textannotation disambiguated wl-creative-work\">DNA molecule<\/span> and transcribe it to an intermediary molecule called messenger ribonucleic acid or mRNA. Then, the information in the mRNA molecule is translated for the <span id=\"urn:enhancement-3c094f60-6afe-4680-a724-5c400065e60f\" class=\"textannotation disambiguated wl-thing\">amino acids<\/span>, which are the building blocks of proteins.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">It is an efficient work house, with DNA being the overseers and instructions, while the mRNA and <span id=\"urn:enhancement-e0f1e027-7532-40b5-bcc6-066e6f6bac5a\" class=\"textannotation disambiguated wl-thing\">amino acids<\/span> do all the hard work in creating proteins.\u00a0<\/span><\/p>\n<h3><strong>DNA Helps Your Body Grow<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">DNA is like the recipe instructions for a meal, however, instead of it being a meal, it is you. DNA gives mRNA instructions to translate for the <span id=\"urn:enhancement-9cd0c057-dc8b-4a08-b254-daa9fac9c7ea\" class=\"textannotation disambiguated wl-thing\">amino acids<\/span> to create\u2026 you.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">DNA contains the instructions to create us, or our cat, our dog, that plant we keep in the restroom. It gives instructions on how to grow, develop, and reproduce. Our cells read the code given to them by the DNA three bases at a time to generate the proteins that are essential for our growth and survival. Each group of three bases will correspond to specific <span id=\"urn:enhancement-752e7d2e-1f2c-4fa4-8d90-3fe41e4ff051\" class=\"textannotation disambiguated wl-thing\">amino acids<\/span>, which are the building blocks of proteins, as we previously noted. An example of this would be the base pairs T-G-G which specify the <span id=\"urn:enhancement-637bda06-660c-4441-ab7e-3a8b68a43bc9\" class=\"textannotation disambiguated wl-thing\">amino acid<\/span> tryptophan, the base pairs G-G-C would specify the <span id=\"urn:enhancement-45800416-d41c-4992-aaab-8ec5767fd7f2\" class=\"textannotation disambiguated wl-thing\">amino acid<\/span> <span id=\"urn:enhancement-bc008d1d-b7bd-400c-9dc8-002e50796206\" class=\"textannotation disambiguated wl-thing\">glycine<\/span>.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><span id=\"urn:enhancement-e21f633b-3031-48c8-9bb3-782434f6370b\" class=\"textannotation disambiguated wl-creative-work\">Proteins<\/span> are made up of different <span id=\"urn:enhancement-1f656621-2908-4ea4-9435-79a20f29a7ab\" class=\"textannotation disambiguated wl-thing\">amino acid<\/span> combinations, when they are placed together in the correct order, every protein will have a unique structure and <span id=\"urn:enhancement-d59cb20a-82ea-4aed-9900-1a8567f1bd94\" class=\"textannotation disambiguated wl-thing\">function<\/span> inside your body.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">DNA makes us grow, exist, develop, and eventually reproduce. We wouldn\u2019t be here without it&#8230;. Literally.\u00a0<\/span><\/p>\n<h3><strong>The Structure Of DNA Provides a Mechanism for Heredity.\u00a0<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">DNA is very important in terms of heredity. It is what packs in all the genetic information and passes it on to the next generation, and the next, and the next. It is how we can do DNA tests that will tell us where our ancestors came from.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The basis for this lies in the way that DNA makes genes and genes make up chromosomes. As we have 23 pairs of chromosomes. Twenty-two of these pairs which are called autosomes look the same in either gender. The 23rd pair are the sex chromosomes, which create the biological differences between males and females. Females will have two copies of the X chromosome (XX), and males will have one X and Y chromosome.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Both parents of a child will have reproductive cells, the sperms in a male and the eggs (ovum) in a female, and these contain half the number of chromosomes, 23 each. When the sperm fertilizes an egg, this gives rise to a cell with a complete set of chromosomes, therefore the child will inherit half of their genes from each of their biological parents.\u00a0<\/span><\/p>\n<h3><strong>How Does DNA Create Proteins?<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">We covered this briefly before. Understanding the workings of the factory going on inside you, where the DNA transfers information on how to create proteins to the mRNA which translates this information for the <span id=\"urn:enhancement-54d9832f-5bff-4710-a466-adffebf9938e\" class=\"textannotation disambiguated wl-thing\">amino acids<\/span> which then create the proteins.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The <span id=\"urn:enhancement-0e0b0426-eb25-4d3d-a773-326723dcb668\" class=\"textannotation disambiguated wl-thing\">function<\/span> of how DNA does this is simply laid in how DNA stores information for other cells and parts of our biological makeup to do what they are supposed to in order to create a functional life form.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Remember that our inner workings are much like a factory with DNA, genes, mRNA, <span id=\"urn:enhancement-cd3eb75c-9ee3-4c8d-9c39-17ffe87518c1\" class=\"textannotation disambiguated wl-thing\">amino acids<\/span>, and proteins all having their individual functions and all working together to create you as a living organism.\u00a0<\/span><\/p>\n<h2 id=\"anchor-4\" style=\"padding-top: 100px; margin-top: -100px; -webkit-background-clip: content-box; background-clip: content-box;\"><strong>Origin of DNA<\/strong><\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-5210\" src=\"https:\/\/www.mybiosource.com\/learn\/wp-content\/uploads\/2021\/09\/Origin-Of-DNA.jpg\" alt=\"Origin Of DNA\" width=\"1000\" height=\"401\" srcset=\"https:\/\/www.mybiosource.com\/learn\/wp-content\/uploads\/2021\/09\/Origin-Of-DNA.jpg 1000w, https:\/\/www.mybiosource.com\/learn\/wp-content\/uploads\/2021\/09\/Origin-Of-DNA-980x393.jpg 980w, https:\/\/www.mybiosource.com\/learn\/wp-content\/uploads\/2021\/09\/Origin-Of-DNA-480x192.jpg 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) and (max-width: 980px) 980px, (min-width: 981px) 1000px, 100vw\" \/><\/p>\n<p><span style=\"font-weight: 400;\">The origin of DNA would be the universe. DNA came into being as life began, as life cannot exist without DNA in reality.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">However, something that is worth talking about in DNA origins in the <span id=\"urn:enhancement-7aa1d89f-893b-4b00-a78b-fd283a4385d2\" class=\"textannotation disambiguated wl-creative-work\">RNA<\/span> replication origin.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><span id=\"urn:enhancement-0ad8118f-65a7-4b8b-a16f-1a5e4b1ad66b\" class=\"textannotation disambiguated wl-creative-work\">DNA replication<\/span> origins are characterized by three structures; the sites for binding proteins, mainly initiation and auxiliary proteins, a characteristically <\/span><a href=\"https:\/\/academic.oup.com\/femsre\/article\/36\/2\/408\/565738\" target=\"_blank\" rel=\"noopener nofollow\"><span style=\"font-weight: 400;\">AT-rich region<\/span><\/a><span style=\"font-weight: 400;\"> that is unwound, and sites and structural properties involved in regulating initiation events.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The ability to replicate is essential for every living being, the duplication of genetic information is carried out by replication proteins. It is physically visible in many viruses, consider the herpes <span id=\"urn:enhancement-7245bf3e-95cb-4798-8599-ea81700be2d3\" class=\"textannotation disambiguated wl-thing\">virus<\/span> for example, this is a prime example of <span id=\"urn:enhancement-bdcebe25-1c35-46a7-a3ec-38417bd74ba4\" class=\"textannotation disambiguated wl-creative-work\">DNA replication<\/span>. How this happens is through mechanisms, and this is something worth discussing, as <span id=\"urn:enhancement-fa29f84b-c84b-4d2d-abe5-c526f9e76481\" class=\"textannotation disambiguated wl-creative-work\">DNA replication<\/span> is not only something that happens normally in every living being, but it is also something that happens in viruses, thus allowing the spread of these viruses.\u00a0<\/span><\/p>\n<h3><strong>Viral DNA Replication Mechanisms<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Cellular genomes have double-stranded DNA, however, viral DNA genomes are diverse, some may have circular or linear double stranded DNA genomes while others may have circular <span id=\"urn:enhancement-8564447d-3e53-4657-912f-053e3edcdcf3\" class=\"textannotation disambiguated wl-thing\">single stranded<\/span> DNA genomes.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><span id=\"urn:enhancement-4d475866-c3b8-47fe-8119-31c075810a60\" class=\"textannotation disambiguated wl-thing\">Single stranded<\/span> DNA genomes are replicated via a rolling circle replication with a double-stranded DNA intermediate. On the other hand, double-stranded viral DNA genomes are replicated via either classical theta or Y-shape replication, by rolling circle, or by linear strand replacement.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Replications can also be symmetric, or it can be <\/span><a href=\"https:\/\/www.aatbio.com\/resources\/faq-frequently-asked-questions\/What-is-the-asymmetry-of-DNA-replication\" target=\"_blank\" rel=\"noopener nofollow\"><span style=\"font-weight: 400;\">asymmetric<\/span><\/a><span style=\"font-weight: 400;\">, in which both strands are replicated one after the other rather than simultaneously. Some viral replication mechanisms are also used by plasmids (rolling circles) and some of these will encode <span id=\"urn:enhancement-8e2da6bb-aedf-4a13-baf7-037791d2c9db\" class=\"textannotation disambiguated wl-creative-work\">DNA replication<\/span> proteins homologous to viral ones, this suggests that plasmids may have originated from very ancient viruses and have simply lost their capsid genes.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The initiation of viral <span id=\"urn:enhancement-875547a8-a2a2-451e-b3aa-5d9eaa6c850f\" class=\"textannotation disambiguated wl-creative-work\">DNA replication<\/span> needs to have a specific viral encoded initiator protein which can be a site-specific <\/span><a href=\"https:\/\/www.sciencedirect.com\/topics\/biochemistry-genetics-and-molecular-biology\/endonuclease#:~:text=Endonucleases%20are%20enzymes%20that%20cleave,at%20very%20specific%20nucleotide%20sequences\" target=\"_blank\" rel=\"noopener nofollow\"><span style=\"font-weight: 400;\">endonuclease,<\/span><\/a><span style=\"font-weight: 400;\"> or a protein that can trigger double-stranded unwinding. Plasmid and viral endonucleases involved in this rolling-circle replication are actually evolutionary related.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The minimal need for DNA chain elongation is a DNA <span id=\"urn:enhancement-56817a48-6829-42e2-abad-59ee0b498ef5\" class=\"textannotation disambiguated wl-thing\">polymerase<\/span> (which is a member of a family of enzymes that catalyze the synthesis of DNA molecules from nucleoside triphosphates- i.e. the molecular precursors of DNA).\u00a0<\/span><\/p>\n<h3><strong>When and Where DNA Replication Mechanisms Originated<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">There is no clear answer to this. You could argue that archaeal and eukaryal versions of <span id=\"urn:enhancement-f2dd9328-8d84-4e87-84c5-62c3a88495fb\" class=\"textannotation disambiguated wl-creative-work\">DNA replication<\/span> proteins were already present in <\/span><a href=\"https:\/\/en.wikipedia.org\/wiki\/Last_universal_common_ancestor\" target=\"_blank\" rel=\"noopener nofollow\"><span style=\"font-weight: 400;\">LUCA (Last Universal Common Ancestor)<\/span><\/a><span style=\"font-weight: 400;\"> then they may have appeared successively in the same lineages ancestral to LUCA, or perhaps in different lineages, thus being later mixed in LUCA. However, it is unclear how a new <span id=\"urn:enhancement-07117103-b131-4007-b790-f8f6e53ea968\" class=\"textannotation disambiguated wl-creative-work\">DNA replication<\/span> machinery could be selected in any organisms that is already containing a more advanced\/ evolved version\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">However, if <span id=\"urn:enhancement-a3f792c4-51ca-4955-8650-905e53d8e81b\" class=\"textannotation disambiguated wl-thing\">bacterial<\/span> and <\/span><a href=\"https:\/\/www.britannica.com\/science\/archaea\" target=\"_blank\" rel=\"noopener nofollow\"><span style=\"font-weight: 400;\">archaeal<\/span><\/a><span style=\"font-weight: 400;\">\/ eukaryal versions of <span id=\"urn:enhancement-8d3d5d78-c32d-467a-b960-116dba7d408f\" class=\"textannotation disambiguated wl-creative-work\">DNA replication<\/span> proteins appear in different lineages, then you could still imagine that they have evolved differing properties, which would explain their ability to coexist in a singular cell.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">It is also thought that there are two distinct sets of <span id=\"urn:enhancement-ec14805d-b57d-4238-add3-112b43a37078\" class=\"textannotation disambiguated wl-creative-work\">DNA replication<\/span> proteins that originated after LUCA, one in a common lineage to archaea and eukarya, and one in a proto-bacterium. This would make sense, however, the rooting of this is highly disputed. In fact phylogenetic data that supports this rooting is not valid, although not wrong, and instead it is proposed that instead there is eukaryal rooting or a fusion between proto-bacterium and proto-archaeon to give <\/span><a href=\"https:\/\/www.biologyonline.com\/dictionary\/eukarya#:~:text=The%20domain%20comprised%20of%20eukaryote,two%20are%20Archaea%20and%20Bacteria.\" target=\"_blank\" rel=\"noopener nofollow\"><span style=\"font-weight: 400;\">eukarya<\/span><\/a><span style=\"font-weight: 400;\">.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">However, the dispute goes on, perhaps one day we will know.\u00a0<\/span><\/p>\n<p id=\"4\">Summary<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-5211\" src=\"https:\/\/www.mybiosource.com\/learn\/wp-content\/uploads\/2021\/09\/Summary-1.jpg\" alt=\"Scientist explaining DNA\" width=\"1000\" height=\"401\" srcset=\"https:\/\/www.mybiosource.com\/learn\/wp-content\/uploads\/2021\/09\/Summary-1.jpg 1000w, https:\/\/www.mybiosource.com\/learn\/wp-content\/uploads\/2021\/09\/Summary-1-980x393.jpg 980w, https:\/\/www.mybiosource.com\/learn\/wp-content\/uploads\/2021\/09\/Summary-1-480x192.jpg 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) and (max-width: 980px) 980px, (min-width: 981px) 1000px, 100vw\" \/><\/p>\n<p><span style=\"font-weight: 400;\">DNA is both immensely basic, and immensely complicated. It is the foundation of all life, trees have DNA, your cat, your dog, your hamster, the ant on the sidewalk, and yes, of course, you.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">DNA is made from a spiraling helix made from four <span id=\"urn:enhancement-3f06245a-88a5-400a-8c9e-eddfae436da3\" class=\"textannotation disambiguated wl-thing\">chemical<\/span> bases; <span id=\"urn:enhancement-1b63cfa2-f3c5-488e-8ff7-76f1a7e8cec2\" class=\"textannotation disambiguated wl-thing\">adenine<\/span>, <span id=\"urn:enhancement-87df98c4-39b9-4302-a72b-18dd07c94248\" class=\"textannotation disambiguated wl-thing\">guanine<\/span>, <span id=\"urn:enhancement-ad93c879-444c-4fb2-8f4e-88b432b25565\" class=\"textannotation disambiguated wl-thing\">cytosine<\/span>, and <span id=\"urn:enhancement-191bfa00-5818-4d9c-b8ce-8662b4454f21\" class=\"textannotation disambiguated wl-thing\">thymine<\/span>. It makes up your body, instructs mRNA, <span id=\"urn:enhancement-27bee5a9-f119-4f11-ac13-1917cc4298c7\" class=\"textannotation disambiguated wl-thing\">amino acids<\/span> and proteins on how to create and maintain your body and being. It decides the color of your eyes, your hair, your facial structure, and we get a great deal of it from our parents.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">DNA is found in our genetics and every person, male or female, has 23 single chromosomes, containing DNA in our sperm or eggs that is then passed onto our children.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Thanks to DNA we can do fantastic things, fight viruses and diseases, understand the core functioning of the human body, animal bodies, and plant bodies. You might not believe it, but the basic photosynthesis classes you had to take in school as part of biology were teaching you a little something about plant DNA!\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">DNA can also help people connect with long-lost relatives, and find out where their ancestors came from. In all of us, most of our genes are the same, with only a few differences that make each of us unique. However, at the very core, in the deepest roots of our DNA, we are all the same, made up of proteins created by hardworking <span id=\"urn:enhancement-3d0e6805-b3d2-4976-a1fb-826020d988c8\" class=\"textannotation disambiguated wl-thing\">amino acids<\/span>. If nothing else can tell you we are all alike, DNA surely can.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Table of Contents 1. Introduction A. Historical contributions to science B. Modern advances in medicine C. Importance of GoFR D. Benefits and concerns of GoFR 2. What is Gain of Function research? 3. What is the purpose of Gain of Function research? A. How GoFR allows for better understanding of key symptoms and the development [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":5206,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[31],"tags":[],"class_list":["post-5204","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"_links":{"self":[{"href":"https:\/\/www.mybiosource.com\/learn\/wp-json\/wp\/v2\/posts\/5204","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.mybiosource.com\/learn\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.mybiosource.com\/learn\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.mybiosource.com\/learn\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.mybiosource.com\/learn\/wp-json\/wp\/v2\/comments?post=5204"}],"version-history":[{"count":1,"href":"https:\/\/www.mybiosource.com\/learn\/wp-json\/wp\/v2\/posts\/5204\/revisions"}],"predecessor-version":[{"id":9262,"href":"https:\/\/www.mybiosource.com\/learn\/wp-json\/wp\/v2\/posts\/5204\/revisions\/9262"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.mybiosource.com\/learn\/wp-json\/wp\/v2\/media\/5206"}],"wp:attachment":[{"href":"https:\/\/www.mybiosource.com\/learn\/wp-json\/wp\/v2\/media?parent=5204"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.mybiosource.com\/learn\/wp-json\/wp\/v2\/categories?post=5204"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.mybiosource.com\/learn\/wp-json\/wp\/v2\/tags?post=5204"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}