SAT Subject Biology Practice Question 152: Answer and Explanation

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Question: 152

2. The graph shows the changes in free energy before, during, and after a biochemical reaction.

Which describes the effect of a catalytic enzyme on this reaction?

A. Energy decreases at point 1.
B. Energy increases at point 1.
C. Energy decreases at point 2.
D. Energy increases at point 2.
E. Energy decreases at point 3.

Correct Answer: C


Enzymes lower the activation energy of biochemical reactions they catalyze. The activation energy is represented by point 2.

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