Considering the catabolite repression mechanism, which observation would make you suspect it IS occurring?
A) CRP bound to promoter sites
B) elevated levels of transcripts for maltose and sucrose catabolism
C) relatively low intracellular cyclic AMP levels
D) RNA polymerase bound to biosynthetic promoter sequences

Question

Quizplus · Accepted Answer

Catabolite repression occurs when glucose or another preferred carbon source is available, leading to a decrease in intracellular cyclic AMP levels. This in turn reduces the activity of the cAMP-CRP complex that normally activates transcription of genes involved in alternative carbon source utilization. Therefore, relatively low intracellular cyclic AMP levels would make you suspect that catabolite repression is occurring. The other options (A, B, and D) do not necessarily indicate catabolite repression.

Considering the Catabolite Repression Mechanism, Which Observation Would Make You