Q. 74.5( 6 Votes )

Why does the lac

Answer :

The enzyme beta-galactosidase is synthesized by E.coli, is used to catalyze the hydrolysis of a disaccharide, lactose into galactose and glucose.

Lactose binds to the repressor molecule (repressor m RNA) and thus preventing the repressor molecule from binding with lac operon. Since operon is free from binding, the RNA polymerase can easily bind to the operator region and transcribes the operon.

After some time due to continuous use of lactose by cells, decreases its quantity. Eventually, in the absence of lactose, the repressor molecule (m RNA) can easily bind with the operator region and thereby transcribing the operon. This shuts down the operon.

The low-level expression of lac operon has to be present has to be present in a cell for all time for the lactose (the inducer) to enter the cells.

Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
view all courses

(a) Why does DNA Biology - Board Papers

Control of gene eBiology - Exemplar

<span lang="EN-USBiology - Board Papers

A. Explain PolygeBiology - Board Papers