Which bases are purines?

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Multiple Choice

Which bases are purines?

Explanation:
Purines are the larger bases with two fused rings. Among the standard nucleobases, Adenine and Guanine have this two-ring structure, so they are purines. Cytosine and Thymine are pyrimidines, which have a single ring, so they are not purines. The other options mix a purine with a pyrimidine, which doesn’t fit the definition. In DNA, purines pair with pyrimidines to keep the helix width consistent: A pairs with T, and G pairs with C. So Adenine and Guanine are the purines.

Purines are the larger bases with two fused rings. Among the standard nucleobases, Adenine and Guanine have this two-ring structure, so they are purines. Cytosine and Thymine are pyrimidines, which have a single ring, so they are not purines. The other options mix a purine with a pyrimidine, which doesn’t fit the definition. In DNA, purines pair with pyrimidines to keep the helix width consistent: A pairs with T, and G pairs with C. So Adenine and Guanine are the purines.

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