Jacob and Monod studied lactose metabolism in $E. coli$ and proposed the operon concept. The operon concept is applicable to:

Which one of the following sets contains enzymes coded by the structural genes of the $lac$ operon of $E. coli$?

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.

At what level does gene expression not occur?

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 ......

Which of the following binds to the repressor,causing the repressor and the operator to dissociate from each other?