The active site of an enzyme is the region that?

Question

a. binds allosteric regulators of the enzyme
b. is involved in the catalytic reaction of the enzyme
c. binds the products of the catalytic reactions
d. is inhibited by the presence of a coenzyme or a cofactor
e. both A & B

Answer 1

B
The active site of the enzyme is where the substrate of the reaction binds. When the substrate binds to the enzyme at the active site, this creates the enzyme substrate complex and the enzyme catalyzes the reaction.

The allosteric region is a region other than the active site. When allosteric regulators bind to the enzyme, it changes the shape of the enzyme so that the substrate cannot bind, thus inhibiting the enzyme from catalyzing the reaction.

The products are what are created by the reaction.

A coenzyme or cofactor is sometimes needed before a reaction can take place. If one of these is needed, the enzyme cannot catalyze a reaction until the coenzyme or cofactor is prsent.

Answer 2

Allosteric regulators DO NOT bind to the active sites of enzymes--they bind elsewhere on the enzyme. So, B is your best answer.

Answer 3

e