Which of the following individuals pioneered the use of chemicals to reduce the incidence of infections during surgery?
A. Nightingale
B. Snow
C. Ehrlich
D. Lister
E. Semmelweis
Answer: D
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Consider a tariff levied on the importer of a consumer good. The tariff is ultimately paid by
a. the importer. b. the consumer. c. competing foreign firms. d. competing domestic firms.
Chart the path of air from the atmosphere to the blood. What will be an ideal response?
If calcium is not present in the muscle cell what complications can occur in regards to muscle contraction?
A. Tropomyosin will not be pulled away from the myosin binding sites. B. The power stroke will not be produced preventing the actin filament from moving. C. Myosin heads will not bind to the actin filament. D. All of these are complications resulting from a lack of calcium.
"Engaging in aerobic activity three times each week will reduce cholesterol levels" is a:
A) substantiated explanation. B) testable hypothesis. C) scientific control. D) critical experiment. E) null hypothesis.