Inducible Vs repressible operons Defined by response of operon to a metabolite(small molecule) Type of EXamples operon Presence of Effect Metabolite Operon Inducible metabolite lactose lac Repressible metabolite OFFInducible vs. repressible operons Metabolite Inducible Repressible Effect ON OFF Type of operon Presence of Operon metabolite Trp lactose lac trp Defined by response of operon to a metabolite (small molecule). metabolite Examples