The differentiation of organs and tissues in a developing organism is associated with:

The lac operon consists of

In the Operon concept,the regulator gene functions as:

Define an operon,give an example,and explain an inducible operon.

In the medium where $E$. coli was growing, lactose was added, which induced the lac operon. Then, why does the lac operon shut down some time after the addition of lactose in the medium?

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