Q. Which of the following statements about lac-operon is correct?
A) Galactose can act as an inducer of lac operon
B) Gene i is constitutively expressed
C) Lactose activates repressor to bind to the operator
D) Genes i, z, y and a share single common promoter
Explanation
[Solution from source] The repressor is synthesised all the time (constitutively) from the i gene. Lactose (not galactose) is the inducer and it inactivates the repressor; the i gene has its own promoter. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.