Questions
In E. coli, the lac operon gets switched on when
a
lactose is present and it binds to the repressor
b
repressor binds to operator
c
RNA polymerase binds to the operator
d
lactose is present and it binds to RNA polymerase
detailed solution
Correct option is A
When lactose is present, it act as an inducer and binds to the repressor and inactivates it. This repressor fails to bind to operator. Therefore, the RNA polymerase binds to the promoter and transcript mRNA thus switching on the lac operon and allowing transcription to proceed.Talk to our academic expert!
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Number of regulatory and structural genes present in lac operon are
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