The tightly bound non-proteinaceous organic compound in enzyme, is
a)	Coenzyme	b)	Prosthetic group	c)	Cofactor	d)	Apoenzyme

(b)

Cofactors are non-proteinaceous constituents of conjugated enzyme which are associated with proteinaceous apoenzyme. These are divided into three categories.

1. Prosthetic Groups: Organic compound tightly bound to apoenzyme.

2. Coenzyme: Organic in nature and bound to apoenzyme at the time of course of action.

Metal Ions: Inorganic in nature.