What best describes the function of cobalamin (vitamin B12)?

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Multiple Choice

What best describes the function of cobalamin (vitamin B12)?

Explanation:
Vitamin B12 functions as a coenzyme in essential metabolic reactions. It cofactors two key enzymes: methionine synthase, which remethylates homocysteine to methionine, and methylmalonyl-CoA mutase, which converts methylmalonyl-CoA to succinyl-CoA. These reactions support DNA synthesis, myelin formation, and integration of certain nutrient intermediates into the TCA cycle, linking to energy metabolism. Among the options, describing B12 as a coenzyme best captures its primary role; the other choices describe properties that aren’t its defining function. Note that absorption involves intrinsic factor and the ileum, not a direct coenzyme role.

Vitamin B12 functions as a coenzyme in essential metabolic reactions. It cofactors two key enzymes: methionine synthase, which remethylates homocysteine to methionine, and methylmalonyl-CoA mutase, which converts methylmalonyl-CoA to succinyl-CoA. These reactions support DNA synthesis, myelin formation, and integration of certain nutrient intermediates into the TCA cycle, linking to energy metabolism. Among the options, describing B12 as a coenzyme best captures its primary role; the other choices describe properties that aren’t its defining function. Note that absorption involves intrinsic factor and the ileum, not a direct coenzyme role.

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