Smoke from fossil fuels, motor vehicle exhaust, and nitrogen fertilizers can lead to
a. greater cloud formation.
b. acid rain.
c. basic rain.
d. rain with high mineral content.
e. salted rain.
B
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During breakdown of fatty acids, carbons are removed ________ at a time with each turn of the cycle, and two carbon units are released as ________.
A. one; methane B. two; acetyl-CoA C. two; ethanol D. one; carbon dioxide
Spongy bone is indicated by
a. A. b. B. c. C. d. D. e. E.
Which substance induces "bolting," the rapid elongation of a plant stem?
A) a gibberellin B) abscisic acid (ABA) C) ethylene D) phytochrome
A small amount of antigen is injected under the skin of a patient. After 30 minutes there is no apparent change at the injection site, but 36 hours later the patient reports that the area is red and swollen. This type of response is due to
A) type I hypersensitivity. B) type II hypersensitivity. C) type III hypersensitivity. D) type IV hypersensitivity. E) immunodeficiency.