Suppose that you observe a mutant E. coli in which CAP is always inactive. In the presence of lactose and low levels of glucose, what would you expect the gene expression from this mutant's lac operon to be?

Question

Quizplus · Accepted Answer

CAP (catabolite activator protein) is necessary for the high-level transcription of the lac operon in low glucose conditions. If CAP is always inactive, even in the presence of lactose and low glucose, the expression from the lac operon would be greatly reduced, not reaching the levels seen under normal conditions where CAP can activate transcription.

Suppose That You Observe a Mutant E