試題詳解

32. Which of the following statements is   true   regarding enzyme pathways?
(A) The most effective way to control a pathway is to regulate every enzyme in the pathway.
(B) Metabolic pathways are necessary since enzymes usually catalyze only one specific reaction.
(C) A regulatory enzyme is regulated only by molecules within the given pathway.
(D) An enzyme pathway always proceeds in only one direction, never in reverse.
(E) None of the above are true.