Purines are which bases?

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Prepare for the Campbell Biology Concepts and Connections test. Hone your skills with multiple choice questions, flashcards, hints, and thorough explanations. Ace your exam effortlessly!

Multiple Choice

Purines are which bases?

Explanation:
Purines are nitrogenous bases with two-ring structures. The purines present in DNA and RNA are adenine and guanine. This two-ring setup distinguishes them from pyrimidines, which have a single ring and include cytosine, thymine, and uracil. In base pairing, purines pair with pyrimidines: adenine pairs with thymine (or uracil in RNA) and guanine pairs with cytosine. So adenine and guanine are the bases that are purines.

Purines are nitrogenous bases with two-ring structures. The purines present in DNA and RNA are adenine and guanine. This two-ring setup distinguishes them from pyrimidines, which have a single ring and include cytosine, thymine, and uracil. In base pairing, purines pair with pyrimidines: adenine pairs with thymine (or uracil in RNA) and guanine pairs with cytosine. So adenine and guanine are the bases that are purines.

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