Purines include which bases?

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Study for the Principles of Biology Exam 2. Enhance your understanding with multiple-choice questions, detailed explanations, and study tips. Ace your biology test!

Multiple Choice

Purines include which bases?

Explanation:
Purines are the two-ring nitrogenous bases in nucleic acids. The bases that belong to this group are adenine and guanine. Cytosine and thymine (and uracil in RNA) are pyrimidines, which have a single ring. This distinction matters because purines pair with pyrimidines to keep the DNA double helix width consistent, with adenine pairing to thymine (or uracil in RNA) and guanine pairing to cytosine. So the bases that are purines are adenine and guanine.

Purines are the two-ring nitrogenous bases in nucleic acids. The bases that belong to this group are adenine and guanine. Cytosine and thymine (and uracil in RNA) are pyrimidines, which have a single ring. This distinction matters because purines pair with pyrimidines to keep the DNA double helix width consistent, with adenine pairing to thymine (or uracil in RNA) and guanine pairing to cytosine. So the bases that are purines are adenine and guanine.

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