The lac operator is DNA.
D001435:Bacteriophages; D002845:Chromatography; D004269:DNA, Bacterial; D004279:DNA, Viral; D004794:Enzyme Repression; D004926:Escherichia coli; D007785:Lactose; D008967:Molecular Biology
D004269:DNA, Bacterial; D004279:DNA, Viral; D007785:Lactose