Which Statement About Catabolite Repression is False

Question

Which statement about catabolite repression is false?
A) Glucose is the preferred energy source for E. coli and represses the utilization of other sugars.
B) The CAP protein is involved in catabolite repression of the lac operon.
C) RNA polymerase is the effector molecule that enables CAP to bind to the promoter.
D) The CAP protein and its effector molecule exert positive control over the transcription of the lac operon.
E) High glucose concentrations decrease the intracellular concentration of the effector molecule of the CAP protein.

Accepted Answer

The effector molecule that enables CAP to bind to the promoter is cyclic AMP (cAMP), not RNA polymerase. RNA polymerase is the enzyme responsible for transcribing the DNA sequence into RNA.