Question

gene regulation
in the case of e. coli breaking down lactose, the mechanism that helps control the activity of the related genes is known as the lac operon. the lac operon is a regulatory system that controls the expression of the genes involved in lactose metabolism. it consists of three main components: the lacz, lacy, and laca genes.
in the case of e. coli breaking down lactose, which mechanism helps control the activity of the related genes?
the homoeotic genes
the lac operon
the tata box

Explanation:

The text clearly states that the lac - operon is the mechanism controlling the activity of genes related to lactose metabolism in E. coli. Homoeotic genes are involved in body - plan development and TATA box is related to transcription initiation, not lactose - related gene regulation in E. coli.

Answer:

B. the lac operon