The Lac Operon is an Example of _______ Operon

Question

The lac operon is an example of _______ operon.
A)a noninducible
B)a constitutive
C)an inducible
D)a repressible
E)an irrepressible

Accepted Answer

The lac operon is a classic example of an inducible operon, which means that the expression of genes is turned on by the presence of an inducer molecule. In the case of the lac operon, the inducer molecule is lactose. When lactose is present, it binds to the repressor protein and changes its shape, preventing it from binding to the operator site. This allows RNA polymerase to transcribe the genes needed to break down lactose.