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

乳糖操纵元是操纵元；色氨酸操纵元是阻遏操纵元。

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

植物病物中研究得最清楚是胡萝卜软腐菌果胶酸内裂解酶。