any of a group of compounds that are inactive precursors of enzymes and require some change (such as the hydrolysis of a fragment that masks an active enzyme) to become active
例句
用作名词(n.)
The reactor has some zymogen and acetogen, but no methanogen bacteria.反应器中有一定量的发酵菌和产乙酸菌，但无产甲烷菌。
