Thymine belongs to which class of nitrogenous bases?

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Study for the Biochemistry Module 6 Exam. Study with flashcards and multiple choice questions; each question includes hints and explanations. Gear up to ace your test!

Multiple Choice

Thymine belongs to which class of nitrogenous bases?

Explanation:
Nitrogenous bases are grouped by their ring structure: purines have two fused rings, while pyrimidines have a single ring. Thymine is a pyrimidine, because it has that single-ring structure with carbonyl groups. This places thymine with cytosine and uracil as pyrimidines. Purines, in contrast, are adenine and guanine, which carry the two-ring system. In DNA, thymine pairs with adenine, and in RNA, thymine is replaced by uracil, which is also a pyrimidine.

Nitrogenous bases are grouped by their ring structure: purines have two fused rings, while pyrimidines have a single ring. Thymine is a pyrimidine, because it has that single-ring structure with carbonyl groups. This places thymine with cytosine and uracil as pyrimidines. Purines, in contrast, are adenine and guanine, which carry the two-ring system. In DNA, thymine pairs with adenine, and in RNA, thymine is replaced by uracil, which is also a pyrimidine.

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