KVPY SX SB Exam 05-Nov-2017 Question Paper

Question : 120 of 120

Marks: +1, -0

The schematic below describes the status of lac operon in the absence of lactose. Which ONE of the following happens when lactose is present in the cell ?

Lactose binds to $P^i$ and stops the transcription of i.
Lactose is converted to allolactose, which binds to $P^{\lac}$ and results in the displacements of the repressor from O.
Lactose is converted to allolactose, whichbinds to the repressor protein and prevents its interaction with O.
Lactose has no effect on the status of the lac operon.

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