22. Which one is incorrect? (2.5 points)
(A)Vitamins are often precursors to coenzymes.
(B)Vitamins are small biomolecules that are needed in small amounts in the diets of higher animals.
(C)The water-soluble vitamins are vitamin C (ascorbate, an antioxidant) and the vitamin B complex (components of coenzymes).
(D)Ascorbate is required for the hydroxylation of proline residues in collagen, a key protein of connective tissue.

(E)The water-soluble vitamins are vitamin A (a precursor of retinal), D (a regulator of calcium and phosphorus metabolism), E (an antioxidant in membranes), and K (a participant in the carboxylation of glutamate).