30 N2 可經由氮固化作用(nitrogen fixation)轉換成 ammonia,其所用到的兩個酵素為:
(A) nitrate reductase, nitrite reductase
(C) dihydrofolate reductase, methione synthase
(B) glutamate synthase, glutamate dehydrogenase
(D) nitrogenase, nitrogenase reductase

1. 題目解析題目提到的「氮固定作用...