Nutrition and Vitamin Deficiencies · USMLE Step 1

Which vitamin plays a critical coenzyme role in redox reactions of carbohydrate and protein metabolism and whose deficiency leads to mucocutaneous lesions and corneal changes?

  1. Vitamin B2 (riboflavin)
  2. Vitamin B12 (cobalamin)
  3. Vitamin B6 (pyridoxine)
  4. Vitamin C (ascorbic acid)
Show answer and explanation

Correct answer: Vitamin B2 (riboflavin)

Riboflavin (vitamin B2) serves as coenzyme in numerous redox reactions; deficiency impairs metabolic pathways and leads to mucocutaneous lesions, cheilosis, stomatitis and corneal vascularization.

Difficulty: Medium Question 15 of 21

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