Which of the following acts as an inducer in the lac operon?
Aglucose
Btryptophan
Clactose
Dgalactose
Answer:
C. lactose
Read Explanation:
When lactose is present in the medium, it binds to the repressor protein changing its conformation while preventing the former’s binding at the operator region.
Thus the structural genes are transcribed and lactose is catabolized, therefore lactose acts as an inducer in the lac operon.
