The lac operon and its control
The Lac operon - showing its genes and its binding sites.
In the "induced" state, the lac repressor is NOT bound to the operator site.
In the "repressed" state, the repressor IS bound to the operator.
These figures are taken from a web site at the University of Arizona. The full addresses for the figures are
http://www.blc.arizona.edu/Marty/411/Lectures/Figures/Lac_Operon.GIF
http://www.blc.arizona.edu/Marty/411/Lectures/Figures/Lac_Operon_rep.GIF
http://www.blc.arizona.edu/Marty/411/Lectures/Figures/Lac_Operon_ind.GIF.