Purines are which bases?

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Test your knowledge with the Campbell Biology Concepts and Connections Quiz. Study with flashcards and multiple choice questions, each question has hints and explanations. Prepare effectively for your biology concepts exam!

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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