Which of the Following Statements is Correct

Question

Which of the following statements is correct?
A) Adenine and guanine are both purines.
B) Adenine and guanine are both pyrimidines.
C) Adenine is a purine, and guanine is a pyrimidine.
D) Adenine is a pyrimidine, and guanine is a purine.

Accepted Answer

Adenine and guanine are both purines. Purines have a double-ring structure composed of a six-membered ring fused to a five-membered ring, and adenine and guanine both have this structure. Pyrimidines, on the other hand, have a single-ring structure, with either a six-membered or five-membered ring.