Which statement about pyrimidine bases is true?

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Multiple Choice

Which statement about pyrimidine bases is true?

Explanation:
Pyrimidine bases have a single-ring structure. This distinguishes them from purines, which have two rings. Examples of pyrimidines are cytosine, thymine, and uracil. Thymine is in DNA, while uracil is in RNA; cytosine appears in both. The single-ring shape is why the correct statement is that they are single-ring structures. The other options conflict with the actual structure (double-ring), composition (not all purines), or presence in RNA (uracil is in RNA).

Pyrimidine bases have a single-ring structure. This distinguishes them from purines, which have two rings. Examples of pyrimidines are cytosine, thymine, and uracil. Thymine is in DNA, while uracil is in RNA; cytosine appears in both. The single-ring shape is why the correct statement is that they are single-ring structures. The other options conflict with the actual structure (double-ring), composition (not all purines), or presence in RNA (uracil is in RNA).

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