Coenzymes Such as Water-Soluble Vitamins Are Needed in Only Small

Multiple Choice

Coenzymes such as water-soluble vitamins are needed in only small amounts because

A) only small amounts of enzymes are present in each cell.
B) only small amounts of substrates are available at any one time.
C) they can be eliminated in the urine.
D) each vitamin molecule can be reused many times as a cofactor.
E) they can be stored in the liver for future use.