Which bases are purines?

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Multiple Choice

Which bases are purines?

Explanation:
Purines are the bases with a double-ring structure. In both DNA and RNA, the purine bases are adenine and guanine. The other bases—cytosine and thymine (and uracil in RNA)—are pyrimidines and have a single ring. Because adenine and guanine each have two fused rings, they’re classified as purines, while cytosine, thymine, and uracil are pyrimidines. That’s why the pair consisting of adenine and guanine is the correct choice.

Purines are the bases with a double-ring structure. In both DNA and RNA, the purine bases are adenine and guanine. The other bases—cytosine and thymine (and uracil in RNA)—are pyrimidines and have a single ring. Because adenine and guanine each have two fused rings, they’re classified as purines, while cytosine, thymine, and uracil are pyrimidines. That’s why the pair consisting of adenine and guanine is the correct choice.

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