In humans and other primates as well as in guinea pigs, this vitamin cannot be synthesized because of the absence of the enzyme L-gulonolactone oxidase: the vitamin is_____________?
Correct answer: A. Ascorbic acid
- A. Ascorbic acid
- B. Nicotinic acid
- C. Pantothenic acid
- D. Folic acid
Explanation
Humans and guinea pigs cannot synthesize ascorbic acid because they lack L-gulonolactone oxidase, the final enzyme in its biosynthetic pathway. Therefore vitamin C must be obtained from the diet.
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