Biology · Enzymes

OPTION A: The co-enzymes are the derivatives of vitamins. e.g. ATP, NAD+, and FAD+ are common coenzymes.

OPTION B: The protein part of the enzyme which is catalytically inactive is called apoenzyme.

OPTION C: An enzyme that requires a cofactor and becomes active only if the cofactor is combined with it. Such an active enzyme is called a holoenzyme. Hence, C is the correct option.

OPTION D: Proenzyme is any of a group of proteins that are converted to active enzymes by partial breakdown, as by the action of an acid or other enzyme. 

The co-enzymes are the derivatives of vitamins. e.g. ATP, NAD+, and FAD+ are common coenzymes. 

The protein part of the enzyme which is catalytically inactive is called apoenzyme. 

An enzyme that requires a cofactor and becomes active only if the cofactor is combined with it. Such an active enzyme is called a holoenzyme. Hence, C is the correct option. 

Proenzyme is any of a group of proteins that are converted to active enzymes by partial breakdown, as by the action of an acid or other enzyme.