Q. Select the two correct statements out of the four (a–d) given below about lac operon. (a) Glucose or galactose may bind with the repressor and inactivate it (b) In the absence of lactose the repressor binds with the operator region (c) The z-gene codes for permease (d) This was elucidated by Francois Jacob and Jacque Monod The correct statements are
A) (a) and (b)
B) (b) and (c)
C) (a) and (c)
D) (b) and (d)
Explanation
[Solution from source] Without lactose, the repressor binds the operator and blocks transcription, and the lac operon was described by Jacob and Monod. The inducer that inactivates the repressor is lactose (allolactose), not glucose or galactose. The z gene codes for β-galactosidase, while permease comes from the y gene. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.