Cytosine is one of the five main nucleobases found in the nucleic acids DNA and RNA. It is a pyrimidine derivative, with a heterocyclic aromatic ring and two substituents attached (an amine group at position 4 and a keto group at position 2). The nucleoside of cytosine is cytidine. In Watson-Crick base pairing, it forms three hydrogen bonds with guanine.
Filename: DNA Base Pair - Cytosine Molecule.jpg
Copyright ©Phil Degginger/Color-Pic Inc. Size:
10599x9920 / 8.6MB