21. Defects in which of the following enzyme will NOT cause hyperammonemia?

(A) Cabomoyl phosphate synthetase I
(B) Ornithine permease
(C) N-acetylglutamate synthase
(D) Arginase
(E) Ornithine transcarbamoylase

題目解析這道題目考查的是與氨基酸代謝...