Which bases are purines?

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Multiple Choice

Which bases are purines?

Explanation:
Purines are the bases with a two-ring structure. The bases that fit this description are adenine and guanine. They’re larger because their two fused rings distinguish them from the single-ring pyrimidines—cytosine and thymine (and uracil in RNA). So adenine and guanine are purines, while cytosine and thymine are pyrimidines.

Purines are the bases with a two-ring structure. The bases that fit this description are adenine and guanine. They’re larger because their two fused rings distinguish them from the single-ring pyrimidines—cytosine and thymine (and uracil in RNA). So adenine and guanine are purines, while cytosine and thymine are pyrimidines.

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