KCET 2014 Biology Solved Paper

Question : 25 of 60

Marks: +1, -0

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

The structural genes fail to produce polycistronic mRNA.
The repressor protein binds to RNA polymerase and prevents translation.
The repressor protein attaches to the promoter sequence and derepresses the operator.
The inducer molecule binds to repressor protein and RNA polymerase binds to promoter sequence.

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