Which of the following is the most effective treatment for acquired immune deficiency syndrome (AIDS)?
A. vaccine to coat proteins
B. reverse transcriptase inhibitors such as AZT
C. protease inhibitors
D. a combination of drugs directed at both reverse transcriptase and the HIV protease
E. There is no effective treatment because the virus is always integrated into the host DNA.
D
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Which of the following statements is true?
A. Lactic acid is a product of aerobic respiration; ethyl alcohol is a product of fermentation. B. Oxygen is a product of cellular respiration; carbon dioxide is a product of photosynthesis. C. Glucose is a product of aerobic respiration; lactic acid is a product of anaerobic respiration. D. Oxidation is the loss of electrons; reduction is the gain of electrons.
The semilunar valves of the mammalian heart _____
A) are the route by which blood flows from the atria to the ventricles B) are found only on the right side of the heart C) are the attachment sites where the pulmonary veins empty into the heart D) prevent backflow of blood in the aorta and pulmonary arteries E) are at the places where the anterior and posterior venae cavae empty into the heart
The element found in the body that has the greatest number of atoms is
1.phosphorus. 2.oxygen. 3.hydrogen. 4.calcium. 5.carbon.
A nosocomial infection is
A) Always present but inapparent at the time of hospitalization. B) Always caused by medical personnel. C) Acquired during the course of hospitalization. D) Always caused by pathogenic bacteria. E) Only a result of surgery.