What is the location of the product of the $Lac \, y$ gene?

In which of the following are monocistronic genes found?

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:

In the $lac$ operon,which of the following acts as an inducer?

Select the correct option for $\beta$-galactosidase.

The $Lac-Operon$ model was elucidated by