試題詳解

47. Animals are totally dependent on plants and microorganisms for nitrogen fixation and nitrate assimilation because animals:
(A) do not have the reducing power (NADPH) to fix nitrogen.
(B) lack the enzyme aminotransferase.
(C)lack the enzymes to reduce
(D)lack carbamoyl-phosphate synthetase I.
(E)lack glutamate dehydrogenase.