The organ of Corti
a. functions in the awareness of motion and the
sense of equilibrium.
b. controls the sense of depth perception.
c. converts sound vibrations into impulses that
enable hearing.
d. secretes cerebrospinal fluid.
e. detects light energy.
Answer: c
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To which phylum does the American black bear (Ursus americanus) belong?
a. Mammalia b. Carnivora c. Chordata d. Ursidae e. Ursus
The atomic nucleus consists of
a. neutrons and electrons. b. neutrons only. c. protons and electrons. d. neutrons and protons. e. protons only.
Which of the following describes the Lac operon in E. coli when both lactose and glucose are present in the culture medium?
A. The Lac repressor, but not CAP, is bound to the Lac operon's regulatory DNA, and the Lac operon is not expressed. B. Neither CAP nor the Lac repressor is bound to the Lac operon's regulatory DNA, and the Lac operon is not expressed. C. CAP and the Lac repressor are both bound to the Lac operon's regulatory DNA, and the Lac operon is not expressed. D. CAP binds to the Lac repressor, preventing it from binding to the Lac operon's regulatory DNA, and the Lac operon is expressed. E. CAP, but not the Lac repressor, is bound to the Lac operon's regulatory DNA, and the Lac operon is expressed.
Which of the following statements concerning the hepatitis B vaccine is FALSE?
A) It must be given in three doses. B) It is protective against the virus in 95% of vaccinated individuals. C) It is recommended for high-risk groups. D) It must be repeated every five years. E) Immunity can last at least 20 years and may be for life.