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 ......

Select two statements out of the four given statements $(i-iv)$ with respect to the $lac$ operon.
$(i)$ Glucose or galactose binds with the repressor and inactivates it.
$(ii)$ In the absence of lactose,the repressor binds with the operator.
$(iii)$ The $Z$-gene codes for permease.
$(iv)$ It was elucidated by Francois Jacob and Jacques Monod.

In the $lac$ operon, what does the term "$lac$" refer to?

In the tryptophan operon,which of the following statements is correct?

The one gene-one enzyme hypothesis was postulated by

Which enzyme is the expression product of the $y$ gene in the $lac$-operon?