Which one of the following enzymes is required for the entry of lactose into the $E. coli$ cell?

Consider the following statements of gene regulation and select the correct statements $:$
$(A)$ Expression of genes is regulated by metabolic,physiological,or environmental conditions.
$(B)$ Galactose can act as an inducer for the lac operon.
$(C)$ The operator region is adjacent to the promoter elements in most operons.
$(D)$ In the lac operon,lactose is transported into the cell through the action of permease.
$(E)$ Regulation of the lac operon by a repressor is referred to as positive regulation.

Which gene produces the lactose repressor?

Which of the following enzymes increases the permeability of the bacterial cell to lactose?

The end product of a metabolic pathway binds to the operator to make it more active,so that it can easily bind with the repressor. In this case,the end product is called a/an ......

When $Escherichia$ $coli$ cells are cultured in a medium where $Lactose$ is absent,the $i$ gene of $Lac$ $Operon$ continues to produce repressor $mRNA$,because it is: