The basic steps of an enzyme-catalyzed reaction are:
A) substrate and product combine, forming an S-P complex. The reaction occurs, enzymes are released, and the unchanged substrate is released and recycled.
B) substrate and enzyme combine, forming an E-S complex. The reaction occurs, products are released, and the unchanged enzyme is released and recycled.
C) substrate, enzyme, and product combine, forming an S-E-P complex. The reaction occurs, enzymes are released, and the unchanged enzyme is released and recycled.
D) enzyme and product combine, forming an E-P complex. The reaction reverses, enzymes are released, and the unchanged substrate is released and recycled.

Question

Quizplus · Accepted Answer

The correct answer is B because the first step of an enzyme-catalyzed reaction is the combination of the substrate and enzyme to form an E-S complex. The reaction then occurs, and products are released, leaving the unchanged enzyme to be released and recycled. The other answer choices are incorrect because they do not accurately describe the basic steps of an enzyme-catalyzed reaction.

The Basic Steps of an Enzyme-Catalyzed Reaction Are