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DNA - Wikipedia
https://en.wikipedia.org/wiki/DNA
WebModifications of the bases cytosine and adenine, the more common and modified DNA bases, play vital roles in the epigenetic control of gene expression in plants and animals. A number of noncanonical bases are known to occur in DNA. Most of these are modifications of the canonical bases plus uracil. Modified Adenine. N6-carbamoyl-methyladenine
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DNA | Definition, Discovery, Function, Bases, Facts, & Structure
https://www.britannica.com/science/DNA
WebMay 10, 2023 · Each strand of a DNA molecule is composed of a long chain of monomer nucleotides. The nucleotides of DNA consist of a deoxyribose sugar molecule to which is attached a phosphate group and one of four nitrogenous bases: two purines ( adenine and guanine) and two pyrimidines ( cytosine and thymine ).
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Discovery of the structure of DNA (article) | Khan Academy
https://www.khanacademy.org/science/biology/dna-as-the-genetic-material/dna-discovery-and-structure/a/discovery-of-the-structure-of-dna
WebIn Watson and Crick's model, the two strands of the DNA double helix are held together by hydrogen bonds between nitrogenous bases on opposite strands. Each pair of bases lies flat, forming a "rung" on the ladder of the DNA molecule. Base pairs aren't made up of just any combination of bases.
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Base Pair - National Human Genome Research Institute
https://www.genome.gov/genetics-glossary/Base-Pair
WebMay 24, 2023 · Definition. A base pair consists of two complementary DNA nucleotide bases that pair together to form a “rung of the DNA ladder.”. DNA is made of two linked strands that wind around each other to resemble a twisted ladder — a shape known as a double helix.
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DNA function & structure (with diagram) (article) | Khan Academy
https://www.khanacademy.org/test-prep/mcat/biomolecules/dna/a/dna-structure-and-function
WebHow does the fact that DNA is made up of a backbone, to which a variety of bases are attached, enable a mechanism of DNA synthesis that is simple (i.e. repeats the same step over and over again) while, at the same time, allowing …
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Deoxyribonucleic Acid (DNA) Fact Sheet - National Human …
https://www.genome.gov/about-genomics/fact-sheets/Deoxyribonucleic-Acid-Fact-Sheet
WebAug 24, 2020 · DNA is made of chemical building blocks called nucleotides. These building blocks are made of three parts: a phosphate group, a sugar group and one of four types of nitrogen bases. To form a strand of DNA, nucleotides are linked into chains, with the phosphate and sugar groups alternating.
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What is DNA?: MedlinePlus Genetics
https://medlineplus.gov/genetics/understanding/basics/dna/
WebJan 19, 2021 · The information in DNA is stored as a code made up of four chemical bases: adenine (A), guanine (G), cytosine (C), and thymine (T). Human DNA consists of about 3 billion bases, and more than 99 percent of those bases are the same in all people.
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DNA Structure and Shape | Ask A Biologist
https://askabiologist.asu.edu/dna-shape-and-structure
WebApr 24, 2010 · A closer look at the chemical structure of DNA shows four main building blocks. We call these nitrogenous bases: Adenine (A), Thymine (T), Guanine (G), and Cytosine (C). DNA also includes sugars and phosphate groups (made of phosphorus and oxygen). These make the phosphate-deoxyribose backbone.
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Nucleobase - Wikipedia
https://en.wikipedia.org/wiki/Nucleobase
WebIn DNA, the most common modified base is 5-methylcytosine (m 5 C). In RNA, there are many modified bases, including those contained in the nucleosides pseudouridine (Ψ), dihydrouridine (D), inosine (I), and 7-methylguanosine (m 7 G).
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1.2: Structure of DNA and RNA - Biology LibreTexts
https://bio.libretexts.org/Bookshelves/Biochemistry/Supplemental_Modules_(Biochemistry)/1%3A_DNA/1.2%3A_Structure_of_DNA_and_RNA
WebDNA (deoxyribonucleic acid) and RNA (ribonucleic acid) are composed of two different classes of nitrogen-containing bases: the purines and pyrimidines. The most commonly occurring purines in DNA are adenine and guanine: Figure 1.2.1: Purines. The most commonly occurring pyrimidines in DNA are cytosine and thymine: Figure 1.2.2: …
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