Questions
Lac operon is switched on by
a
Regulator
b
Effector
c
Co-repressor
d
Inducer
detailed solution
Correct option is D
Inducer in lac operon is the substrate lactose. When lactose is available it binds to the repressor and does not allow the repressor to bind to operator. In this way transcription of structural genes is promoted by enhancing the binding RNA polymerase to the promoter and its movement along the DNA template strand towards structural genes z, y and a.Talk to our academic expert!
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Number of regulatory and structural genes present in lac operon are
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