The mechanism by which the presence of glucose inhibits the arabinose operon is
A) catabolite repression.
B) repression.
C) DNA polymerase.
D) translation.
E) induction.

Question

Quizplus · Accepted Answer

The mechanism by which the presence of glucose inhibits the arabinose operon is catabolite repression. Glucose is a preferred carbon source, and when it is available, it inhibits the expression of operons involved in utilizing other sugars, such as the arabinose operon. This mechanism allows the cell to conserve energy by using the most efficient carbon source available.

The Mechanism by Which the Presence of Glucose Inhibits the Arabinose