The Obvious Advantage of the Lactose Operon Is That

Multiple Choice

The obvious advantage of the lactose operon is that

A) it allows bacteria to survive in the presence of lactose.
B) lactose-metabolizing enzymes need not be made when lactose is not present.
C) it enables bacteria to make lactose only in the presence of the proper enzymes.
D) it negates the need for milk in the diet of adult humans.
E) it enables glucose to substitute for lactose in the diet of lactose intolerant persons.