Question

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

Answer 1

Lac operon is shut down after some times when the added lactose is utilised from the medium. It is because the repressor protein binds to the operator region of the operon and prevent RNA polymerase from transcribing the operon.