You've discovered an enzyme that can catalyze two different chemical reactions.Which of the following is most likely to be correct?
A)The enzyme contains both α-helices and β-pleated sheets.
B)The enzyme is subject to both competitive inhibition and allosteric regulation.
C)Two types of allosteric regulation occur: The binding of one molecule activates the enzyme,while the binding of a different molecule inhibits it.
D)Either the enzyme has two distinct active sites,or the reactants involved in the two reactions are very similar in size and shape.

Question

Quizplus · Accepted Answer

If the enzyme can catalyze two different reactions, it must have two distinct active sites for each reaction or the reactants involved in both reactions are similar in size and shape. This is because enzymes typically catalyze reactions based on their specific active sites, which will differ based on the reactants involved. Therefore, option D is the most likely explanation. Options A and B do not necessarily follow from the discovery of a versatile enzyme, and option C suggests that the enzyme can be both activated and inhibited by different molecules, which is less likely than the enzyme having two active sites or similar reactants.

You've Discovered an Enzyme That Can Catalyze Two Different Chemical