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
B
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Spontaneous mutations that occur in somatic cells will be transmitted to offspring
A. true B. false
The deep scattering layer refers to:
a. an area where organisms are spread apart in a random manner. b. a dense aggregation of migratory zooplankton and fish. c. a safe area where zooplankton can quickly scatter to avoid predators. d. where sonar from whales travels rapidly to facilitate their communication. e. the abyssal zone.
Which of the following is not part of the lymphatic system?
1.adrenal gland 2.spleen 3.thymus 4.tonsils
The strength and duration of a stimulus determine the amplitude of an action potential
Indicate whether the statement is true or false