Parasites impact host populations by
a. draining nutrients from hosts.
b. making hosts more vulnerable to predation.
c. lowering birth rates and raising death rates.
d. causing sterility
e. all of these.
Answer: e
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Which of the following statements best describes the effect of climate on biome distribution?
A) Average annual temperature and precipitation are sufficient to predict which biome will be found in an area. B) Seasonal fluctuation of temperature is not a limiting factor in biome distribution if areas have the same annual temperature and precipitation means. C) The average climate and pattern of climate are important in determining biome distribution. D) Temperate forests and grasslands are different biomes because they receive a different quality and quantity of sunlight, even though they have essentially the same annual temperature and precipitation. E) Correlation of climate with biome distribution is sufficient to determine the cause of biome patterns.
48. If a person is treated with a single anti-HIV drug, they often end up with a resistant strain. How does this occur?
A. The HIV wants to avoid the drug, so it becomes resistant. B. The drug causes mutations in the HIV, making them resistant to the drug. C. All of the answer choices are correct. D. The drugs kill all sensitive viruses, leaving only the preexisting resistant viruses. E. The drugs weaken the immune system, making a patient more susceptible to infection with resistant strains of HIV.
Large lipid molecules that are absorbed from the GI tract directly enter:
A. mesenteric arteries. B. mesenteric veins. C. lymphatic capillaries. D. the liver.
Which of the following statements represents a good hypothesis?
a. Shoofly pie tastes good. b. The swimming speed of Artemia increases at higher temperatures. c. There is life after death. d. Hemophilia is also known as "bleeder's disease." e. Since sparrows, robins, hawks, and pigeons are all birds and have wings, all birds have wings.