Vitamins and Coenzymes · Zoology

Which vitamin functions primarily as a coenzyme in oxidative decarboxylation reactions?

  1. Vitamin B1 (Thiamine)
  2. Vitamin B2 (Riboflavin)
  3. Vitamin B6 (Pyridoxine)
  4. Vitamin C (Ascorbic acid)
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Correct answer: Vitamin B1 (Thiamine)

Vitamin B1 is converted to thiamine pyrophosphate, a coenzyme required for oxidative decarboxylation of alpha-keto acids. It is essential for carbohydrate metabolism.

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