All of the B vitamins, except one, contain heterocyclic nitrogen ring systems as part of their structure. The exception is

Question

Quizplus · Accepted Answer

The correct answer is C) pantothenic acid. Pantothenic acid is the exception because it does not contain a heterocyclic nitrogen ring system as part of its structure, unlike the other B vitamins. Riboflavin contains a heterocyclic nitrogen ring system called isoalloxazine, thiamin contains a heterocyclic nitrogen ring system called thiazole, and biotin contains a heterocyclic nitrogen ring system called tetrahydrothiophene.

All of the B Vitamins, Except One, Contain Heterocyclic Nitrogen