Which of the following statements about enzyme-catalyzed reactions is true?
A) The free-energy change of the reaction is greater than when the same reaction occurs in the absence of an enzyme.
B) The rate of the reaction is greater than when the same reaction occurs in the absence of an enzyme.
C) Enzymes always drive reactions toward chemical equilibrium.
D) Energy from ATP is required to activate the enzyme before it can catalyze the reaction.

Question

Quizplus · Accepted Answer

Enzymes increase the rate of reactions by lowering the activation energy, which allows more molecules to have the necessary energy to react. Therefore, the rate of the reaction is greater than when the same reaction occurs in the absence of an enzyme. The free-energy change of the reaction is not affected by the presence of an enzyme, and enzymes do not always drive reactions toward chemical equilibrium. Energy from ATP is not always required to activate enzymes, as some enzymes are active without any additional activation.

Which of the Following Statements About Enzyme-Catalyzed Reactions Is True