Which statement about pyrimidine bases is true?

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Prepare for the MTTC Integrated Science (Secondary) Test. Utilize flashcards and multiple choice questions with hints and explanations to ace your exam!

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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