If the binding of the cap-camp complex promotes transcription of the induced lac operon, then how does the negative control of the lac operon by glucose function through the cap-camp complex? see section 18.3 (page 373) . when glucose concentration is high, the concentration of cap and the complex are high. when glucose concentration is high, the concentration of cap and the complex are high. when glucose concentration is high, the concentration of camp and the complex are low. when glucose concentration is high, the concentration of camp and the complex are high.