In a Negative,repressible Regulatory Mechanism,transcription of the Structural Gene(s)occurs in

Multiple Choice

In a negative,repressible regulatory mechanism,transcription of the structural gene(s) occurs in

A) the absence of the co-repressor, but not in its presence.
B) the absence of the inducer but not in its presence.
C) the absence or presence of the co-repressor.
D) the presence of the co-repressor, but not in its absence.
E) None of these are correct.