Which nitrogenous bases have a 2-ring structure?

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Multiple Choice

Which nitrogenous bases have a 2-ring structure?

Explanation:
Purines are nitrogenous bases with two fused rings. Adenine and guanine are classic examples, giving them a larger, two-ring structure. In contrast, pyrimidines have a single ring (cytosine, thymine, uracil). Nucleotides are units that include a base, sugar, and phosphate, and sugars themselves are not bases. So the nitrogenous bases with a two-ring structure are purines.

Purines are nitrogenous bases with two fused rings. Adenine and guanine are classic examples, giving them a larger, two-ring structure. In contrast, pyrimidines have a single ring (cytosine, thymine, uracil). Nucleotides are units that include a base, sugar, and phosphate, and sugars themselves are not bases. So the nitrogenous bases with a two-ring structure are purines.

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