One reason that atrazine, an herbicide in use for more than 40 years, is an environmental problem is that it ____
a. raises the level of air pollution
b. poses a substantial contribution to greenhouse gases
c. disrupts the stratospheric ozone level
d. is responsible for the extinction of bee colonies
e. is an endocrine disrupter and can reduce reproductive capacity in aquatic animals
ANSWER: e
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A factor in the development of multidrug-resistant strains of Mycobacterium tuberculosis is that
A. many TB patients live in less-than ideal circumstances. B. the daily multidrug regimen lasts up to 9 months. C. multiple antibiotics must be taken in the daily regimen. D. All of the above contribute to the development of resistant strains of Mycobacterium tuberculosis.
Malaria is transmitted by
a. sexual contact. b. tsetse flies. c. mosquitoes. d. ticks. e. fleas.
What type of life cycle is observed in plants and some algae?
a. alteration of generations b. alteration of species c. gametophyte and sporophyte generations d. zygotic life cycle e. gametic life cycle
Which term refers to a nutrient that is required by a microorganism in large quantities for use in cell structure and metabolism?
A. element B. growth factor C. trace element D. macronutrient