What happens when allolactose acts as an inducer in lac operon?

see full answer

Start JEE / NEET / Foundation preparation at rupees 99/day !!

21% of IItians & 23% of AIIMS delhi doctors are from Sri Chaitanya institute !!

An Intiative by Sri Chaitanya

Allolactose induces the expression of structural genes of lac operon

Allolactose promotes more tighter binding of the repressor to the operator.

Allolactose is a gratuitous inducer and helps in constitutive expression of lac operon.

The allolactose binds to permease and stops uptake of any further allolactose into the cell.

answer is A.

(Unlock A.I Detailed Solution for FREE)

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Detailed Solution

Allolactose, which is an isomer of lactose is the inducer of operon. A few lactose molecules present in the cytoplasm of E.coli are metabolised into allolactose by β-galactosidase. When this inducer binds to the repressor and changes its conformation, the repressor protein cannot bind to the operator.

Watch 3-min video & get full concept clarity

Result Producing online coaching for JEE/NEET of south India

Largest All India Test Series for JEE/NEET

Best Books for IIT JEE

Best Books for NEET

How to Join IIT after 10th