Repressor Polymerase Systems Types Operons Inducible Bound Tightly

Two types of operons:

inducible systems have the repressor bound tightly to the operator system.  RNA polymerase -x-> Inducer-promoter.  Inducer-promoter + Repressor --> Inducer-Repressor + Promoter; RNA polymerase + Promoter --> promoter-RNA polymerase

Repressible systems allow constant production of a protein product; the repressor made by the regulator gene is inactive until it binds to a corepressor, which is generally a final product of the system.