Which of the following is a purine?

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Multiple Choice

Which of the following is a purine?

Explanation:
Purines and pyrimidines are two categories of nitrogenous bases that make up DNA and RNA. Purines have a two-ring structure, while pyrimidines have a single ring. Among the bases listed, adenine is a purine, alongside guanine. The others—cytosine, uracil, and thymine—are pyrimidines. In DNA, thymine pairs with adenine; in RNA, uracil pairs with adenine. Therefore, adenine is the purine.

Purines and pyrimidines are two categories of nitrogenous bases that make up DNA and RNA. Purines have a two-ring structure, while pyrimidines have a single ring. Among the bases listed, adenine is a purine, alongside guanine. The others—cytosine, uracil, and thymine—are pyrimidines. In DNA, thymine pairs with adenine; in RNA, uracil pairs with adenine. Therefore, adenine is the purine.

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