Molecular Basis of Inheritance Question 151
151. In Escherichia coli, lac operon is induced by
(a) lactose
(b) promoter gene
(c) $\beta$-galactosidase
(d) I-gene
Show Answer
Answer : a
Hints & Solution
(a) Lac operon is an inducible operon system. Which remains switched off normally but becomes operational in the presence of inducer lactose.