A Holoenzyme is a Combination of a Protein and One

Question

A holoenzyme is a combination of a protein and one or more substances called
A)substrates.
B)apoenzymes.
C)catalysts.
D)cofactors.

Accepted Answer

A holoenzyme is a combination of a protein, which is the apoenzyme, and one or more substances called cofactors. The cofactors can be organic molecules like coenzymes or inorganic ions like metal ions. These cofactors are required for the enzyme to function properly and can be thought of as "helpers" for the enzyme. Therefore, choice D, cofactors, is the best answer.