In the United States, what fraction of fresh
water taken from the environment is used to
irrigate agricultural fields?
a. 0.
b. 20.
c. 40.
d. 60.
e. 80.
E
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Four of these five statements about ozone are correct. Select the exception
a. Ground-level ozone forms when compounds released by burning or evaporating fossil fuels are exposed to sunlight. b. Warm temperatures retard ground-level ozone formation. c. Avoiding the gas pump in the heat of the day will limit ozone pollution. d. Ozone is an eye and respiratory tract irritant. e. Ozone is a necessary part of the upper atmosphere but is a pollutant at ground level.
The rate of background extinctions is calculated to be species per year per million species.
A. 0.1 to 1.0 B. 1.0 to 10 C. 0.001 to 0.01 D. 10 to 100 E. None of the answer choices is correct.
Could two individuals who were heterozygous for the Huntington's allele have a normal child?
a. Yes b. No
Numerous Xenopus cells were exposed to varying amounts of ultraviolet light. Some of the resulting cells were observed to lack nucleoli. As a result, one would expect that the cell could not
A) perform cellular respiration. B) replicate its DNA. C) perform photosynthesis. D) synthesize ribosomal RNA. E) perform cellular respiration or replicate its DNA.