A) The represser protein attaches to the promoter sequence and derepresses the operator.
B) The structural genes fail to produce polycistronic mRNA.
C) The inducer molecule binds to represser protein and RNA polymerase binds to promoter sequence.
D) The represser protein binds to RNA polymerase and prevents translation.
Correct Answer: C
Solution :
: Lactose (or all lactose) acts as inducer in Lac operon model. When lactose is present in high concentration in growth medium, it binds to represser protein, which then fails to bind to operator gene. This results in RNA polymerase binding to promoter region in gene and transcription of structural genes.
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