Nucleotide base - Wikipedia
Five nucleobases—adenine (A), cytosine (C), guanine (G), thymine (T), and uracil (U)—are called primary or canonical. They function as the fundamental units of the genetic code, with the bases A, G, C, and T being found in DNA while A, G, C, and U are found in RNA. Thymine and uracil are distinguished by merely the presence or absence of a ...
11.1: Structure and Function - Nucleic Acids - Biology LibreTexts
Aug 23, 2021 · The nitrogenous bases found in nucleic acids include adenine and guanine (called purines) and cytosine, uracil, or thymine (called pyrimidines). There are two sugars found in nucleotides - deoxyribose and ribose (Figure 2.128).
5.11: Structure of Nucleic Acids - Biology LibreTexts
Feb 28, 2021 · RNA nucleotides also contain one of four possible bases: adenine, guanine, cytosine, and uracil (U) rather than thymine. Adenine and guanine are classified as purines. The primary structure of a purine is two carbon-nitrogen rings. Cytosine, thymine, and uracil are classified as pyrimidines which have a single carbon-nitrogen ring as their ...
Chemical RNA Structure | Learn Science at Scitable
RNA consists of four nitrogenous bases: adenine, cytosine, uracil, and guanine. Uracil is a pyrimidine that is structurally similar to the thymine, another pyrimidine that is found in...
The 5 Kinds of Nucleotides - ThoughtCo
Dec 9, 2019 · Adenine binds with thymine (A-T) in DNA and with uracil in RNA (A-U). Guanine and cytosine complement each other (G-C). To form a nucleotide, a base connects to the first or primary carbon of ribose or deoxyribose. The number 5 carbon of the sugar connects to the oxygen of the phosphate group.
9.1 The Structure of DNA - Concepts of Biology - OpenStax
RNA nucleotides contain the nitrogenous bases adenine, cytosine, and guanine. However, they do not contain thymine, which is instead replaced by uracil, symbolized by a “U.” RNA exists as a single-stranded molecule rather than a double-stranded helix. Molecular biologists have named several kinds of RNA on the basis of their function.
28.1 Nucleotides and Nucleic Acids - Chemistry LibreTexts
Nov 24, 2023 · Nucleotides are composed of phosphoric acid, a pentose sugar (ribose or deoxyribose), and a nitrogen-containing base (adenine, cytosine, guanine, thymine, or uracil). Ribonucleotides contain ribose, while deoxyribonucleotides contain deoxyribose.
1.2: Structure of DNA and RNA - Biology LibreTexts
DNA (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: The most commonly occurring …
26.12: DNA and RNA - Chemistry LibreTexts
Sep 21, 2022 · The four bases of DNA are adenine, thymine, cytosine, and guanine, abbreviated A, T, C, and G respectively. In RNA, the base thymine is not found and is instead replaced by a different base called uracil, abbreviated U; the other three bases are …
Base Pair - National Human Genome Research Institute
3 days ago · Attached to each sugar is one of four bases: adenine (A), cytosine (C), guanine (G) [GWA-NeeN] or thymine (T). The two strands are held together by hydrogen bonds between pairs of bases: adenine pairs with thymine, and cytosine pairs with guanine.