17.Which of the following statement for the lambda phage switching between lytic and lysogenic pathways is NOT correct. (A)As long as the cI gene is expressed, lambda phage keeps in the prophage state (B) cl repressor binds to the OR1 to inhibit the expression of cro gene (C) cI repressor cleaves itself and can not form dimer, which is required for the repressor activity (D) After UV irradiation, RecA binds to ssDNA and cleaves cI repressor, then lambda phage is switched to lytic pathway (E) RecA possesses co-protease activity