Purines are which bases?

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Study for the Campbell Biology Concepts and Connections Test. Use flashcards and multiple choice questions, each with detailed explanations. Prepare thoroughly for your exam now!

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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