Which statement best describes the function of Biotin and Pantothenic acid?

Which statement best describes the function of Biotin and Pantothenic acid?

• A. Metabolism of carbohydrates, fats, and proteins.
• B. Visual function
• C. Immune modulation
• D. Hormone synthesis

Answer: (A)

Biotin and pantothenic acid are central to energy metabolism because they act as cofactors that enable the body to process nutrients from carbohydrates, fats, and proteins. Biotin serves as a coenzyme for several carboxylases that add CO2 to substrates, which is essential for gluconeogenesis and for metabolizing certain amino acids and fats. Pantothenic acid forms part of coenzyme A, the carrier of acyl groups that drives the major entry points of fuel into energy pathways—acetyl-CoA formation, fatty acid synthesis and oxidation, and the acetyl-CoA–dependent steps of the TCA cycle. Because these roles touch on the processing of all three macronutrients, the statement describing their function as metabolism of carbohydrates, fats, and proteins best captures their overall metabolic contributions. For context, biotin-dependent enzymes include pyruvate carboxylase (gluconeogenesis), acetyl-CoA carboxylase (fatty acid synthesis), and propionyl-CoA carboxylase (part of amino acid and odd-chain fatty acid metabolism). Pantothenic acid’s CoA partner is required for converting pyruvate to acetyl-CoA, beta-oxidation of fatty acids, and entry of acetyl groups into the TCA cycle, as well as fatty acid synthesis via malonyl-CoA. Other options point to roles not primarily tied to these vitamins—visual function, immune modulation, or hormone synthesis involve different nutrients and pathways.

Biotin and pantothenic acid are central to energy metabolism because they act as cofactors that enable the body to process nutrients from carbohydrates, fats, and proteins. Biotin serves as a coenzyme for several carboxylases that add CO2 to substrates, which is essential for gluconeogenesis and for metabolizing certain amino acids and fats. Pantothenic acid forms part of coenzyme A, the carrier of acyl groups that drives the major entry points of fuel into energy pathways—acetyl-CoA formation, fatty acid synthesis and oxidation, and the acetyl-CoA–dependent steps of the TCA cycle. Because these roles touch on the processing of all three macronutrients, the statement describing their function as metabolism of carbohydrates, fats, and proteins best captures their overall metabolic contributions.

For context, biotin-dependent enzymes include pyruvate carboxylase (gluconeogenesis), acetyl-CoA carboxylase (fatty acid synthesis), and propionyl-CoA carboxylase (part of amino acid and odd-chain fatty acid metabolism). Pantothenic acid’s CoA partner is required for converting pyruvate to acetyl-CoA, beta-oxidation of fatty acids, and entry of acetyl groups into the TCA cycle, as well as fatty acid synthesis via malonyl-CoA. Other options point to roles not primarily tied to these vitamins—visual function, immune modulation, or hormone synthesis involve different nutrients and pathways.