Question

Name the only heterocyclic nitrogen base present in DNA but not in RNA.

Answer 1

1) These nitrogenous bases are adenine (A), uracil (U), guanine (G), thymine (T), and cytosine (C). Uracil is only present in RNA, replacing thymine.

Pyrimidines include thymine, cytosine, and uracil.

They have a single ring structure.