Q. What will be the binding status of regulatory proteins in lac operon when concentrations of both lactose and glucose are very low in the culture medium?

• (A) Only the repressor remains bound to the operator
• (B) Only the cyclic AMP-Catabolic Activator Protein (cAMP-CAP) complex remains bound to the CAP binding site
• (C) Neither the repressor nor cAMP-CAP complex remain bound to their respective binding sites
• (D) Both the repressor and cAMP-CAP complex remain bound to their respective binding sites