Lactose metabolising enzyme, produced in the presence of loctose only is

Lactose metabolising enzyme, produced in the presence of lactose only is

In E.coli, there enzymes galactosidase, permease and transacetylase are produced in the presence of lactose. Explain why the enzymes are not synthesized in the absence of lactose.

Nitrogenase enzyme is produced by:

In the function of the lac operon in E-coli, the lac genes z, y, a are transcribed in the presence of lactose because

Hydrolysis of proteins in the presence of enzymes produces: