In toxicology studies, LD50 can be best described as the dose ________
A) at which 50% of an exposed population develops disease
B) at which 50% of an exposed population develops a chronic effect from the toxicant
C) in which at least 50% of the exposed population is not affected by the toxicant
D) at which 50% of an exposed population is killed or displays a specific symptom
E) in which more than 50% of the population dies as a result of the toxicant development
D
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When 100-kg astronaut Sally ejects 0.1 kg of gas at 50 m/s from her propulsion pistol, she recoils at
A. 5.0 m/s. B. 0.5 m/s. C. 0.05 m/s. D. 50 m/s.
If a nucleus of Th absorbs a neutron and the resulting nucleus undergoes two successive beta decays (emitting electrons), what nucleus results?
A) Americium-232 B) Plutonium-232 C) Thorium-233 D) Uranium-233
What divides European Russiafrom Siberia?
A) the Ural Mountains B) the eastern border of Ukraine C) the center of Siberia D) a line running from the Baltic to the Adriatic E) along the trans-Siberian railroad
Why is 70% ethanol rather than 95% ethanol used in sterilizing skin before injections?
A) 70% ethanol kills bacteria by denaturing their surface proteins. B) 70% ethanol kills bacteria by penetrating them and coagulating their proteins. C) Special precautions must be taken when using 95% ethanol. D) None of the above is correct.