You have isolated a previously unstudied protein, identified its complete structure in detail, and determined that it catalyzes the breakdown of a large substrate. You notice it has two binding sites. One of these is large, apparently the bonding site for the large substrate; the other is small, possibly a binding site for a regulatory molecule. What do these findings tell you about the mechanism of this protein?
A) It is probably an enzyme that works through allosteric regulation.
B) It is probably an enzyme that works through competitive inhibition.
C) It is probably a structural protein that is involved in cell- to- cell adhesion.
D) It is probably a cell membrane transport protein, like an ion channel.
E) It is probably a structural protein found in cartilage or skeletal tissue.

Question

Quizplus · Accepted Answer

The presence of a large binding site for the substrate suggests that the protein is an enzyme. The presence of a small binding site suggests that the protein is regulated by a small molecule, indicating that it is probably an enzyme that works through allosteric regulation.

You Have Isolated a Previously Unstudied Protein, Identified Its Complete