The vitamin which functions as the coenzyme (or part of the coenzyme) for a variety of reactions of the type, RH + carbon dioxide -- R-COOH, is A) biotin. B) pyridoxine. C) pantothenate. D) B₁₂. E) folate.

Question

The vitamin which functions as the coenzyme (or part of the coenzyme) for a variety of reactions of the type, RH + carbon dioxide --> R-COOH, is A) biotin. B) pyridoxine. C) pantothenate. D) B₁₂. E) folate.

Quizplus · Accepted Answer

Biotin functions as a coenzyme in carboxylation reactions, which involve the addition of a carboxyl group to a substrate. This matches the type of reaction described in the question, where carbon dioxide (CO2) is added to a substrate (RH) to form a carboxylic acid (R-COOH). Therefore, biotin is the best choice as the vitamin that functions as a coenzyme for these reactions.

The Vitamin Which Functions as the Coenzyme (Or Part of the Coenzyme)