Diseases such as scrapie in sheep, "mad cow" disease in cattle, and Creutzfeldt-Jakob disease in humans are known as
A. retroviruses.
B. viroids.
C. viruses.
D. emerging viruses, for example Ebola.
E. TSEs (transmissible spongiform encephalopathies).
Answer: E
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Which of the following is caused by a protozoan infection?
A. malaria B. yellow fever C. tularemia D. infectious mononucleosis
The genetic code is translated in groups of ________ bases.
A. four B. three C. two D. five
A patient with Bruton's agammaglobulinemia has decreased immunoglobulin. This disease affects __________.
A) Macrophages B) natural killer cells C) T cytotoxic cells D) B cells
Bacterial encephalitis and meningitis are difficult to treat because
A) no medications exist for treatment of these infections. B) antibiotics damage nervous tissue. C) many antibiotics cannot penetrate the blood-brain barrier. D) the infections move along peripheral nerves. E) it is very difficult to determine the causative microbe.