The turnover number of an enzyme catalyzed reaction is:
A) used as a measure of enzyme purity.
B) related to the equilibrium constant of the reaction.
C) changes when the concentration of the enzyme is altered.
D) is a measure of the efficiency of the enzyme in catalyzing the reaction.

Question

Quizplus · Accepted Answer

The turnover number, also known as kcat, is the maximum number of substrate molecules that an enzyme can convert to product per unit time when the enzyme is saturated with substrate. Hence, it is a measure of the efficiency of the enzyme in catalyzing the reaction. The turnover number is specific to an enzyme-catalyzed reaction and is not related to the equilibrium constant, nor does it change with the concentration of the enzyme. It can, however, be affected by factors such as pH, temperature, and enzyme inhibitors.

The Turnover Number of an Enzyme Catalyzed Reaction Is