An organic molecule such as a vitamin that makes an enzyme functional is called a/an ________.

A) buffer
B) coactivator
C) catalyst
D) coenzyme

Coenzyme

An organic non-protein compound that binds with an enzyme to catalyze a reaction, essential for the function of many enzymes.

Organic Molecule

A compound containing carbon atoms bonded to hydrogen atoms and often other elements, fundamental to the chemistry of life.

Vitamin

Organic compounds required in small amounts for essential bodily functions and must be obtained through the diet as the body cannot produce them sufficiently.