Hepatitis B infection
A. increases risk for hepatocellular cancer.
B. is due to a flavivirus.
C. has an incubation of 1 to 3 weeks.
D. can be transmitted by the fecal-oral route.
E. All of the choices are correct.
Answer: A
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All evidence suggests that the Neanderthals did not interbreed with our ancestors
A. true B. false
Approximately _____ of IVF pregnancies result in multiple births
a. 5% b. 10% c. 20% d. 50% e. 75%
Visible light comprises wavelengths that vary
between ____ nanometers.
a. 380 and 750 b. 350 and 750 c. 390 and 780 d. 340 and 740 e. 320 and 740
The moon lacks life and varies dramatically in temperature. If we could keep a layer of water spread on the surface of the moon, what effect would it have?
A) Physical conditions would remain the same. B) Because water has a high heat of vaporization, the temperatures would rise to the upper extremes. C) The temperatures would drop to the lower extremes. D) Water would absorb and hold heat and moderate the temperature extremes. E) Life would be possible, but it would have to withstand these extremes in temperature.