Question

Select the two correct statements out of the four (A-D) given below about lac operon.

1. Glucose or galactose may bind with the repressor and inactivate it.
2. In the absence of lactose, the repressor binds with the operator region.
3. The z-gene codes for permease.
4. This was elucidated by Francois Jacob and Jacque Mono.

Options

• B and D

• B and C

• A and B

• A and C

Answer 1

B and D

Explanation:-

Francois Jacob and Jacque Mono discovered that in the absence of lactose, the repressor attaches to the operator gene and creates the specific protein to express itself in the lac operon.