For 10 points, name this operon that regulates the catabolism of a sugar found in milk.
This structure's activity can be measured by the breakdown of ONPG and formation of the yellow orthonitrophenol. One mutation in it is tested for using phenyl-Gal. Two of its structural elements produce a detoxifying transacetylase and a permease. CAP forms a complex with cAMP to allow (*) RNA polymerase to bind to its weak promoter; this allows glucose to downregulate its activity. The repressor produced by this element's I gene is inhibited by the allo- form of the sugar that beta-galactosidase, one of its gene products, breaks down. For 10 points, name this operon that regulates the catabolism of a sugar found in milk.
This structure's activity can be measured by the breakdown of ONPG and formation of the yellow orthonitrophenol.
{lac} operon