How does the negative control of the lac operon by glucose function through inducer exclusion? see section 18.3 (page 373) . view available hint(s) how does the negative control of the lac operon by glucose function through inducer exclusion? see section 18.3 (page 373) . high glucose concentrations prevent the transport of lactose into the cell. high glucose concentrations promote the transport of lactose into the cell. high lactose concentrations prevent the transport of glucose into the cell. high lactose concentrations promote the transport of glucose into the cell.