Question

Describe the regulation of the lack opera by lack repressor and CAP.

Short answer

Opera acts as a single regulated unit having one or more structural genes, a promoter gene, and a regulator gene. A repressor and an inducer. Lac opera is an inducible opera system that is switched on in response to the presence of a chemical.

Step-by-step solution

Lac opera consists.

Structural genes—an operon have one or more structural genes and synthesize mRNAs. Lac opera contains three structural genes Z, Y, and A, and it transcribes a polycistronic mRNA molecule.

Lack repressor and CAP.     

These genes are responsible for the metabolism of lactose for energy generation. A very low level of expression of the lack opera and consequently its enzymes are always present. Initial entry of lactose into bacterium would occur only due to this activity.