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In DNA and RNA, cytosine is paired with guanine. However, it is inherently unstable, and can change into uracil (spontaneous deamination). This can lead to a point mutation if not repaired by the DNA repair enzymes such as uracil glycosylase, which cleaves a uracil in DNA.
cytosine, a nitrogenous base derived from pyrimidine that occurs in nucleic acids, the heredity-controlling components of all living cells, and in some coenzymes, substances that act in conjunction with enzymes in chemical reactions in the body.
8 Νοε 2018 · Cytosine is a pyrimidine derivative, with a heterocyclic, aromatic ring, and two substituents devoted. Heterocyclic compounds are organic compounds (those containing carbon) that have a ring structure containing atoms with carbon like sulfur, oxygen, or nitrogen as part of the ring.
27 Αυγ 2021 · Cytosine can be differed from the other pyrimidines by having a keto group at position 2 and an amine group at position 4 in its heterocyclic aromatic ring. It has a chemical formula of C 4 H 5 N 3 O. Cytosine complementary pairs with guanine in both DNA and RNA as opposed to thymine and uracil that pairs up with adenine in DNA and RNA ...
17 Μαρ 2022 · There are four types of nitrogenous bases in DNA. Adenine (A) and guanine (G) are double-ringed purines, and cytosine (C) and thymine (T) are smaller, single-ringed pyrimidines. The nucleotide is named according to the nitrogenous base it contains.
15 Ιαν 2023 · In double stranded DNA, the guanine (G) base on one strand can form three H-bonds with a cytosine (C) base on another strand (this is called a GC base pair). The thymine (T) base on one strand can form two H-bonds with an adenine (A) base on the other strand (this is called an AT base pair).
19 Αυγ 2024 · Two DNA strands link together in an antiparallel direction and are twisted to form a double helix. The nitrogenous bases face the inside of the helix. Guanine is always opposite cytosine, and adenine is always opposite thymine.
