Questions
What happens when allolactose acts as an inducer in lac operon?
a
Allolactose induces the expression of structural genes of lac operon
b
Allolactose promotes more tighter binding of the repressor to the operator.
c
Allolactose is a gratuitous inducer and helps in constitutive expression of lac operon.
d
The allolactose binds to permease and stops uptake of any further allolactose into the cell.
detailed solution
Correct option is A
Allolactose, which is an isomer of lactose is the inducer of operon. A few lactose molecules present in the cytoplasm of E.coli are metabolised into allolactose by β-galactosidase. When this inducer binds to the repressor and changes its conformation, the repressor protein cannot bind to the operator.Talk to our academic expert!
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Number of regulatory and structural genes present in lac operon are
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