Pyrimidines have how many rings and how many nitrogens?

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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

Pyrimidines have how many rings and how many nitrogens?

Explanation:
Pyrimidines are six-membered heteroaromatic rings with two nitrogen atoms in the ring itself, at positions 1 and 3. So they have one ring and two nitrogens. Examples in biology are cytosine, thymine, and uracil. This differs from purines, which have two rings and four nitrogens. Exocyclic nitrogens (like an amino group attached to the ring) aren’t counted as ring nitrogens.

Pyrimidines are six-membered heteroaromatic rings with two nitrogen atoms in the ring itself, at positions 1 and 3. So they have one ring and two nitrogens. Examples in biology are cytosine, thymine, and uracil. This differs from purines, which have two rings and four nitrogens. Exocyclic nitrogens (like an amino group attached to the ring) aren’t counted as ring nitrogens.

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