The CAP Activator Protein and the Lac Repressor Both Control

Essay

The CAP activator protein and the Lac repressor both control the Lac operon (see Figure 8-53).You create cells that are mutant in the gene coding for the Lac repressor so that these cells lack the Lac repressor under all conditions.For these mutant cells, state whether the Lac operon will be switched on or off in the following situations, and explain why.
Figure 8-53
A.in the presence of glucose and lactose
B.in the presence of glucose and the absence of lactose
C.in the absence of glucose and the absence of lactose
D.in the absence of glucose and the presence of lactose