2.3.6 Coenzymes often function as transient carriers of specific(functional groups during catalysis 2.3.7 Many vitamins, organic nutrients required in small amounts in the diet, are precursors of coenzymes.2.3.6 Coenzymes often function as transient carriers of specific (functional) groups during catalysis. 2.3.7 Many vitamins, organic nutrients required in small amounts in the diet, are precursors of coenzymes