試題詳解

50. What is the importance of the purine nucleoside cycle?
(A)It participates in the conversion of purines into pyrimidines.
(B) It generates fumarate, which inhibits the formation of AMP from IMP.
(C) It provides fumarate as an anaplerotic enhancement of the citric acid cycle.
(D) It inhibits the citric acid cycle in skeletal muscles.
(E)It is used in energy metabolism in the liver.