Regarding the structure of bases in nucleic acids, which, if any, of the following statements is incorrect?
A) Pyrimidines have a single heterocylic ring consisting of four carbon atoms plus two nitrogen atoms that are linked to the same carbonyl (-C=O) group
B) Purines have two heterocyclic rings, each with two nitrogen atoms
C) Thymine = 5-methyluracil.
D) Purines carry an amino group, unlike pyrimidines

Question

Quizplus · Accepted Answer

This statement is incorrect. Purines do not carry an amino group, unlike pyrimidines. Instead, they have a fused ring system with four nitrogen atoms.

Regarding the Structure of Bases in Nucleic Acids, Which, If