Pyrimidines have how many rings?

Study for the Principles of Biology Exam 2. Enhance your understanding with multiple-choice questions, detailed explanations, and study tips. Ace your biology test!

Multiple Choice

Pyrimidines have how many rings?

Explanation:
Pyrimidines are built from a single six-member ring. This is in contrast to purines, which have two rings fused together. In DNA and RNA, the pyrimidines are cytosine, thymine (DNA), and uracil (RNA). So, pyrimidines have one ring.

Pyrimidines are built from a single six-member ring. This is in contrast to purines, which have two rings fused together. In DNA and RNA, the pyrimidines are cytosine, thymine (DNA), and uracil (RNA). So, pyrimidines have one ring.

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