68. Which of the following statements regarding metabolism is NOT correct?
(A) The metabolism can be classified as either catabolic or anabolic reactions.
(B) Enzymes are usually required for cells to carry out reaction under condition of moderate temperature, pressure,and pH.
(C) Glucose, fatty acids, and some amino acids are reduced to form acetyl-CoA, which enters the citric acid cycle.
(D) The energy of metabolism is used to synthesize ATP from ADP and Pi.
(E) Reactions occur spontaneously only when the free energy change is negative.