The lac operon is most active when glucose levels are low and lactose is present.

The lac operon is turned off and on by repressors.

its an operon required for the transport and metabolism of lactose.

explain the regulation of gene expression in lac operon.

The lac operon uses a two-part control mechanism to ensure that the cell expends energy producing the enzymes encoded by the lac operon only when necessary. In the presence of lactose, the lac repressor halts production of the enzymes encoded by the lac operon.