the above E. coli cell, with high glucose and low lactose levels, what happens at the operator?  low lactose causes activation of a repressor protein, allowing it to detach from the operator low lactose causes inactivation of a repressor protein, allowing it to detach from the operator low lactose causes activation of a repressor protein, allowing it to bind to the operator low lactose causes inactivation of a repressor protein, allowing it to bind to the operator all of the above

The binding of the inducer to the repressor causes the repressor to O bind to the operator. stop binding to the operator. bind to the structural genes. stop binding to the structural genes. O bind to other repressors.

A mutation in the trp repressor gene that prevents the apo-repressor from binding the co-repressor What is the correct option from the choices below? causes the Trp repressor to permanently bind the trp operator.   leads to a high level of transcription initiation from the trp promoter, even when tryptophan is present in the medium. does not lead to a high concentration of mRNA molecules that code for the structural genes trp E, D, C, B, A, when tryptophan is present in the medium, because attenuation of the operon will still work. a and b, but not c b and c, but not a

bacterial cell needs to synthesize arginine if it is absent in the environment. If arginine is present in its diet, however, the cell will activate a repressor protein which blocks transcription of the genes that code for the enzymes that synthesize arginine. This is an example of which type of regulation?    Group of answer choices Repressible Inducible Attenuation Post-translational