The lac operon is an inducible operon, whereas the trp operon is a repressible operon.

乳糖是诱导的；色是阻遏的。

The best studied inducible and repressible enzyme in phytopathogenic prokaryotes is endo-pectate lyase in E. carotovora.

植物病原原核生物中研究得最清楚的是胡萝卜软腐菌的果胶内裂解酶。