<prompt> False statement is:Repressor binds operator geneRegulator genes produce repressor subunitsIPTG is inducer but not substrateRegulator gene is inducible  <response>: Ans. D. Regulator gene inducibleRef: Harper 31e page 412Structural genes are inducible, not the regulator genes.Lac I gene produces Repressor subunits.IPTG is an inducer of lac-operon, but itself is not a substrate. This is called gratuitous inducer. 