試題詳解

18. 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) They must be at the same concentration as their substrate to be effective.