Enzymes can be regulated by feedback inhibition, where the end product of a metabolic pathway inhibits the activity of an enzyme earlier in the pathway. The other choices are incorrect. Enzymes can lower the activation energy barrier of a reaction, and they can be reusable and not permanently changed by the reactions they facilitate. Some enzymes require cofactors, but not all. The value of F1F1F1S1F1F1F10G is not a concept related to enzymes.

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Enzymes
A) May Be Subject to Feedback Inhibition $\Delta$ G for a Reaction

Question 143

Multiple Choice

Enzymes

A) may be subject to feedback inhibition.
B) change the value of $\Delta$ G for a reaction.
C) always require cofactors.
D) have no effect on the activation energy barrier of a reaction.
E) are permanently changed by the reactions they facilitate.

Correct Answer: