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.

Question

Quizplus · 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.

Which of the Following Statements Is Correct