What does an operon represent?

Few genes are found in all types of cells of differentiated multicellular organisms of higher classes. These are called:

Which of the following is not produced by $E. coli$ in the lactose operon?

Select the two correct statements out of the four $(i-iv)$ statements given below about the lac operon.
$(i)$ Glucose or galactose may bind with the repressor and inactivate it.
$(ii)$ In the absence of lactose,the repressor binds with the operator region.
$(iii)$ The $z$-gene codes for permease.
$(iv)$ This was elucidated by Francois Jacob and Jacques Monod.
The correct statements are:

Gene regulation governing the lactose operon of $E. coli$ that involves the $lac I$ gene product is:

In prokaryotic $DNA$,the recognition of the promoter region by $RNA$ polymerase is determined in some cases by the interaction of certain proteins with which sequences?