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MDCAT Biology QUESTION #11245
Question 1
Which vitamin acts as a coenzyme for acetyl-CoA carboxylase, the enzyme that catalyzes the first committed step of fatty acid synthesis?
  • Vitamin B$_1$ (Thiamine)
  • Vitamin B$_2$ (Riboflavin)
  • Vitamin B$_3$ (Niacin)
  • Vitamin B$_7$ (Biotin)✔️
Correct Answer Explanation
Biotin (Vitamin B$_7$) is the coenzyme for acetyl-CoA carboxylase, which converts acetyl-CoA to malonyl-CoA — the first committed step of fatty acid biosynthesis.