A researcher is attempting to determine the prevalence of asymptomatic human infection with West Nile virus in New York City. Which of the following would be most useful?
A. Detection of IgG against WNV
B. Viral culture in embryonated eggs
C. Detection of IgM against WNV
D. Tissue culture
E. Electron microscopy
Answer: A
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A population of caterpillars feeds on the leaves of trees in a forest and is in turn food for birds that eat them off the tree leaves. Given this information, which adaptation would be most likely to evolve?
A) Caterpillars would evolve to a larger size. B) Caterpillars would evolve to eat the bark as well as the leaves. C) Birds would evolve to eat more types of insects. D) Caterpillars would evolve to a color that matched the leaves they eat.
Where would you predict an obligate anaerobe would grow in a tube of fluid thioglycollate medium?
At or very near the surface of the broth A little below the surface of the broth Throughout the entire tube At the bottom of the tube
The oversecretion of ________ by the thyroid gland can result in ________.
A. T3; hyperthyroidism B. parathyroid hormone; Graves disease C. T3; hypothyroidism D. calcitonin; hyperthyroidism E. T4; hypothyroidism
The potential causes of chromosomal aberrations include
A. viruses only. B. radiation only. C. a set of specific chemicals. D. viruses and radiation only. E. viruses, radiation, and various chemicals.