An enzyme has a total of four active sites. When you denature the molecule and study its composition, you find that each active site occurs on a different polypeptide. Which of the following hypotheses does this observation support?
A) The enzyme is subject to regulation.
B) The enzyme requires a cofactor to function normally.
C) The protein's structure is affected by temperature and pH.
D) The protein has quaternary structure.

Question

Quizplus · Accepted Answer

The observation that each active site occurs on a different polypeptide suggests that the enzyme has quaternary structure, meaning it is made up of multiple subunits. Each subunit contributes to the formation of an active site, allowing the enzyme to catalyze a specific reaction.

An Enzyme Has a Total of Four Active Sites