3 concepts
The trp Operon: A Repressor Operon
The trp operon is a repressor operon that is either activated or repressed based on the levels of tryptophan in the environment.
Catabolite Activator Protein (CAP): An Activator Regulator
When glucose levels decline in E. coli, catabolite activator protein (CAP) is bound by cAMP to promote transcription of the lac operon.
The lac Operon: An Inducer Operon
The lac operon is an inducible operon that utilizes lactose as an energy source and is activated when glucose is low and lactose is present.