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 ......

$A$ gene that is responsible for the synthesis of a polypeptide chain is called a .......

Identify the $INCORRECT$ statement with reference to the regulation of gene expression.

In the Operon concept,the regulator gene functions as:

Which enzyme will be produced in a cell if there is a nonsense mutation in the lac $Y$ gene?

Select two correct statements from the four $(a-d)$ given below regarding the $lac$ operon.
$(A)$ Glucose or galactose may bind with the repressor gene and induce inactivity.
$(B)$ In the absence of lactose,the repressor binds with the operator region.
$(C)$ The $z$-gene codes for permease.
$(D)$ This was elucidated by Francois Jacob and Jacques Monod.
Which of the following are the correct statements?