Purines have how many rings, and how many nitrogens per ring?

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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

Purines have how many rings, and how many nitrogens per ring?

Explanation:
Purines are bicyclic structures formed by fusing an imidazole ring with a pyrimidine ring. That gives two rings in the purine system. Each ring contains two nitrogen atoms—the pyrimidine portion has two nitrogens, and the imidazole portion also has two nitrogens. So, two rings total with two nitrogens per ring (four nitrogens overall in the purine scaffold). This matches why adenine and guanine, the common purines, carry four nitrogens overall. The other options don’t fit the actual ring count or the nitrogen distribution in purines.

Purines are bicyclic structures formed by fusing an imidazole ring with a pyrimidine ring. That gives two rings in the purine system. Each ring contains two nitrogen atoms—the pyrimidine portion has two nitrogens, and the imidazole portion also has two nitrogens. So, two rings total with two nitrogens per ring (four nitrogens overall in the purine scaffold). This matches why adenine and guanine, the common purines, carry four nitrogens overall. The other options don’t fit the actual ring count or the nitrogen distribution in purines.

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