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1. Operon

   Linked via "Inducible operons"

   Inducible Systems
   Inducible operons are generally "off" in the absence of a required substrate. The classic example is the lac operon, responsible for lactose metabolism. Here, the presence of lactose (or its metabolic analog, allolactose) acts as an inducer, binding to the repressor protein, causing a conformational change that prevents the repressor from binding the ope…