Which of the following is a purine?

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Multiple Choice

Which of the following is a purine?

Explanation:
Purines are nitrogenous bases with a two-ring structure, making them larger than pyrimidines, which have a single ring. In both DNA and RNA, the purines are adenine and guanine, while cytosine, thymine (in DNA), and uracil (in RNA) are pyrimidines. Therefore, the purine listed here is adenine. The others are pyrimidines. This distinction explains why adenine, as a two-ring base, fits the purine category.

Purines are nitrogenous bases with a two-ring structure, making them larger than pyrimidines, which have a single ring. In both DNA and RNA, the purines are adenine and guanine, while cytosine, thymine (in DNA), and uracil (in RNA) are pyrimidines. Therefore, the purine listed here is adenine. The others are pyrimidines. This distinction explains why adenine, as a two-ring base, fits the purine category.

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