Which one of the following statements is true of enzyme catalysts?
A)Their catalytic activity is independent of pH.
B)They are generally equally active on D and L isomers of a given substrate.
C)They can increase the equilibrium constant for a given reaction by a thousand fold or more.
D)They can increase the reaction rate for a given reaction by a thousand-fold or more.
E)To be effective,they must be present at the same concentration as their substrate.

Question

Quizplus · Accepted Answer

Enzyme catalysts can significantly increase the rate of a reaction by a thousand-fold or more by lowering the activation energy required for the reaction to occur. The other statements are not accurate: the activity of enzyme catalysts is often pH-dependent (A), they may have stereospecificity for a particular substrate isomer (B), and they do not affect the equilibrium constant for a reaction (C). Enzyme concentration does not have to be equal to substrate concentration for effective catalysis (E).

Which One of the Following Statements Is True of Enzyme