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.
Answer: b
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