28. What following enzyme can generate ammonium (NH3)?
(A) uroporphyrinogen I synthase
(B) uroporphyrinogen II synthase
(C) uroporphyrinogen III synthase
(D) coproporphyrinogen oxidase
(E) protoporphyrinogen oxidase.

1. 題目解析題目問的是哪一種酶可以產...