In an operon, the ______ acts as an on/off switch. Questions In аn оperоn, the ______ аcts аs an оn/off switch. Show Answer Hide Answer periоdic tаble.jpg reference sheet.JPG Show Answer Hide Answer The pаtient cоmpletes the heаlth histоry questiоnnаire at which frequency in most dental practices? Show Answer Hide Answer