Which bases are purines?

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Study for the Biochemistry Module 6 Exam. Study with flashcards and multiple choice questions; each question includes hints and explanations. Gear up to ace your test!

Multiple Choice

Which bases are purines?

Explanation:
Purines are the bases built with two fused rings, giving them a double-ring structure. Among the common nucleobases, adenine and guanine have this two-ring configuration, so they’re purines. The others listed—cytosine and thymine, uracil and thymine, and adenine with cytosine—are pyrimidines, which have a single ring. Therefore, the bases that are purines are adenine and guanine.

Purines are the bases built with two fused rings, giving them a double-ring structure. Among the common nucleobases, adenine and guanine have this two-ring configuration, so they’re purines. The others listed—cytosine and thymine, uracil and thymine, and adenine with cytosine—are pyrimidines, which have a single ring. Therefore, the bases that are purines are adenine and guanine.

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