Which of the following is false about AIDS?
a. It is caused by the human immunodeficiency
virus.
b. There may be no outward symptoms initially.
c. It weakens the immune system, paving the way
for opportunistic infections.
d. Recent drug therapies have turned it into a
curable disease.
e. Viral particles may be transmitted via blood,
semen, urine, and vaginal secretions.
Answer: d
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An elderly man with chronic heart and lung disease develops Legionella pneumonia. By what route was the infection most likely to have been acquired?
a. Respiratory route, from an infected person b. Inhalation of aerosolized water from a source containing protozoa c. Inhalation of spores from moldy hay d. Exposure to livestock or animal products
Thorough mixing of oxygen and nutrients
within lakes in temperate regions occurs in a. winter and summer. b. winter and spring. c. spring and summer. d. spring and autumn. e. summer and autumn
"The total amount of mass-energy in the universe is constant," is a statement of
A) the first law of thermodynamics. B) the second law of thermodynamics. C) thermodynamic spontaneity. D) entropy. E) enthalpy.
Mei had high blood pressure, so her physician gave her a prescription for a certain drug that lowered her blood pressure by allowing more sodium ions to be excreted in the urine. This drug interfered with the making of ________
A) erythropoietin B) atrial natriuretic hormone C) angiotensin II D) growth hormone