SAT Subject Biology Practice Question 93: Answer and Explanation

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Question: 93

3. With a limited amount of chemical substrate, all of the following factors could directly affect an enzyme's activity EXCEPT

A. pH level
B. inhibitors
C. temperature
D. enzyme cofactors
E. enzyme concentration

Correct Answer: E

Explanation:

Substrates are the limiting factor in a chemical reaction. No mat-ter how much enzyme is available to catalyze a reaction, only so much product can be made unless the substrate is present in excess. Inhibitors, pH level, temperature, and the presence of cofactors could all potentially affect how an enzyme carries out its function and change the reaction rate.

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