A Lack of Which Molecule Would Result in the Cell's

Question

A lack of which molecule would result in the cell's inability to "turn off" genes?
A)operon
B)inducer
C)promoter
D)ubiquitin
E)corepressor

Accepted Answer

The molecule needed to "turn off" genes is a corepressor. It binds to a repressor protein and together they can bind to the operator region of the DNA, preventing transcription. Without the corepressor, the repressor protein would not be able to bind to the operator and the gene would continue to be transcribed.