MHT CET Biology question

Which of the following events would occur in ‘Lac-operon’ of E. coli when the growth medium has high concentration of lactose? [K CET 2014]

(A)The repressor protein attaches to the promoter sequence and derepresses the operator
(B)The structural genes fail to produce polycistronic RNA
(C)The inducer molecule binds to repressor protein and RNA polymerase binds to promoter sequenceCorrect
(D)The repressor protein binds to RNA polymerase and prevents translation

Answer: (C)

Solution

With lactose the inducer (allolactose) binds the repressor, which leaves the operator, so RNA polymerase can bind the promoter and transcribe; the

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Question ID VK-065462