Read the overview and complete the interactivities that follow. the lac operon consists of a series of genes involved in the breakdown of lactose. the expression of the operon is controlled by two regulatory regulate gene expression in response to the levels of glucose and lactose available to relate to the lac operon. proteins, a repressor and an activator. together these two regulatory proteins allow the cell to the cell. the following questions 1 the lacl gene makes a repressor protein 2. the structural proteins encoded by the lac operon are involved in lactose synthesis 3. the cap protein is an activator that binds to the operator 4 the product of lacl is an allosteric protein that can undergo a conformational change when allolactose binds to it . cap binding causes the dna to bend facilitating rna polymerase binding