05-22-2015, 07:33 AM
Escherichia coli is able to grow on a medium containing lactose alone. No glucose or other sugars are present in the growth medium. In these
situations, the bacteria must rely solely on lactose for energy. A special gene pathway, called the lac operon, allows E. coli to accomplish this task.
Which of the following occurs when E. coli is plated on medium containing only lactose?
A. Lactose binds to the repressor
B. The levels of cAMP are decreased and the repressor is inactive
C. The levels of cAMP are increased and the repressor is active
D. The repressor displaces C-reactive protein from the DNA
E. The repressor is detached from RNA polymerase
situations, the bacteria must rely solely on lactose for energy. A special gene pathway, called the lac operon, allows E. coli to accomplish this task.
Which of the following occurs when E. coli is plated on medium containing only lactose?
A. Lactose binds to the repressor
B. The levels of cAMP are decreased and the repressor is inactive
C. The levels of cAMP are increased and the repressor is active
D. The repressor displaces C-reactive protein from the DNA
E. The repressor is detached from RNA polymerase