Which bases are pyrimidines?

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Prepare for the PLTW Biomedical Science Test. Study with flashcards and multiple choice questions, each question comes with hints and explanations. Get ready for your exam!

Multiple Choice

Which bases are pyrimidines?

Explanation:
Pyrimidines are the smaller bases with a single ring. Thymine and cytosine fit this single-ring structure, so they are pyrimidines. Adenine and guanine are purines, which have two rings, so they are not pyrimidines. (In RNA, uracil is another pyrimidine.) Therefore, thymine and cytosine are the bases that are pyrimidines.

Pyrimidines are the smaller bases with a single ring. Thymine and cytosine fit this single-ring structure, so they are pyrimidines. Adenine and guanine are purines, which have two rings, so they are not pyrimidines. (In RNA, uracil is another pyrimidine.) Therefore, thymine and cytosine are the bases that are pyrimidines.

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