All of the organelles in the cell are membrane-bound.

A repressor protein would have which of the following effects on repressible genes with a negative control mechanism?

A) stimulate transcription in the presence of a corepressor
B) turn off transcription in the presence of an inducer
C) stimulate transcription in the presence of a coactivator
D) turn off transcription in the presence of a corepressor
E) does not participate in negative control mechanisms