[1][2] The inducible enzyme is used for the breaking-down of things in the cell.
It is also a part of the Operon Model, which illustrates a way for genes to turn "on" and "off".
The inducer can remove this repressor, turning genes back on.
The operator is a section of DNA where the repressor binds to shut off certain genes; the promoter is the section of DNA where the RNA polymerase binds.
An example of inducible enzyme is COX-2 which is synthesized in macrophages to produce prostaglandin E2 while the constitutive enzyme COX-1 (another isozyme in COX family) is always produced in variety of organs in body (like stomach).