Q.

Given below are two statements.
Statement I: Lactose, if provided in the growth medium of E. coli, will be transported into the cells through the action of permease.
Statement II: In the presence of lactose, the repressor is inactivated by its interaction.
In light of the above statements, choose the correct answer from the options given below.

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a

Both statement I and statement II are correct.

b

Statement I is correct but statement II is incorrect.

c

Both statement I and statement II are incorrect.

answer is A.

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Detailed Solution

Permease, encoded by the lac y gene, is a membrane protein that functions as a lactose permease. Its role is to transport lactose molecules into the bacterial cell, allowing for their metabolism. Lactose binds to the lac repressor protein, causing a conformational change that weakens its binding affinity for the operator region. As a result, the lac repressor is released from the operator, allowing RNA polymerase to initiate transcription of the lac genes. 

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