A) lactose is present and it binds to the represser
B) represser binds to operator
C) RNA polymerase binds to the operator
D) lactose is present and it binds to RNA polymerase
Correct Answer: A
Solution :
[a] When lactose is present, it act as an inducer and binds to the represser and inactivates it. This represser fails to bind to operator. Therefore, the RNA polymerase binds to the promoter and transcript lac mRNA, thus switching on the lac operon and allowing transcription to proceed.You need to login to perform this action.
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