Many coenzymes are derived from
- A. minerals absorbed from the soil
- B. vitamins of the B group
- C. fatty acids stored in adipose tissue
- D. the amino acids of the enzyme itself
Explanation
NAD is made from niacin, FAD from riboflavin and coenzyme A from pantothenic acid, so a deficiency of these vitamins cripples respiration and produces widespread symptoms rather than one local effect. This is the biochemical reason a vitamin is needed in very small quantities but cannot be omitted. Minerals supply cofactors instead, which is the parallel case.
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