Pesticide runoff from a farm into a river is an example of a ____ of pollution
a. nonpoint source
b. reservoir
c. point source
d. pinpoint reserve
e. watershed
ANSWER: a
Biology & Microbiology
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Cell junction structure involves primarily which of the following type of molecule?
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All echinoderms (sea stars and sea urchins) have:
A. a cardiovascular circulatory system and bilateral symmetry. B. a water vascular system and five-fold symmetry. C. a cardiovascular circulatory system and five-fold symmetry.
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What is the leading cause of age-related blindness in the United States?
a. Macular degeneration b. Glaucoma c. Lack of focus d. Cataract e. Colorblindness
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In the Gram-staining procedure, the primary stain is
A. alcohol. B. crystal violet. C. iodine. D. safranin.
Biology & Microbiology