Which statement defines a coenzyme? a. An enzyme precursor b. The active part of an enzyme c. An inactive enzyme that becomes functional upon contact with specific cofactors d. An organic molecule closely associated with enzymes e. A unit consisting of an enzyme bound to reactants plus ATP

The correct option is  'c'

Explanation:

Coenzyme are small molecules that are inactive but when it binds with the protein molecule or called the apoenzyme,it form the active enzyme i.e Holoenzyme.

The function of coenzyme is to enhance the activity of enzyme.

They are not capable of catalyze the reaction  ut helps the enzyme to perform the recation by activating it.

Coenzymes are non protein and organic molecule.

Several water soluble vitamins like Vitamin B1,B2 and B6 acts as a coenzyme as they have the properties of coenzyme.

Explanation:

d. An organic molecule closely associated with enzymes defines a coenzyme