Which of the Following is TRUE Concerning the Structure and Function

Question

Which of the following is TRUE concerning the structure and function of enzymes?
A) All enzymes bind cofactors necessary for their function.
B) An apoenzyme is a combination of a cofactor bound to a holoenzyme.
C) Enzymes can function at a wide range of pH.
D) Competitive inhibition of an enzyme occurs when an inhibitor binds to an allosteric site on the enzyme.
E) After an enzyme has catalyzed a reaction, it resumes its original shape and can interact with a new substrate molecule.

Accepted Answer

After catalyzing a reaction, enzymes resume their original shape and can interact with new substrate molecules. This property is known as enzymatic specificity and is essential for enzymes to carry out their function repeatedly. A, B, C, and D are incorrect statements. Enzymes may or may not bind cofactors, an apoenzyme is a holoenzyme without a bound cofactor, enzymes function within an optimal pH range, and competitive inhibition occurs when an inhibitor binds to the active site of an enzyme, not an allosteric site.