Q.

In the presence of allolactose, the lac repressor in the operon of E coli:

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a

binds to the operator

b

cannot bind to the operator

c

binds to the promoter

d

binds to the regulator

answer is B.

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Detailed Solution

Lactose binds to the repressor and changes its conformation. It cannot bind to the promoter and hence repression does not occur.

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In the presence of allolactose, the lac repressor in the operon of E coli: