Answer :
bases
Nucleotides have three parts: a sugar, a phosphate, and a base. Only the nitrogen base varies. In DNA, there are four nitrogen bases: adenine (A), guanine (G), cytosine (C), and thymine (T).
bases
Nucleotides have three parts: a sugar, a phosphate, and a base. Only the nitrogen base varies. In DNA, there are four nitrogen bases: adenine (A), guanine (G), cytosine (C), and thymine (T).