The transfer of specific molecules through cell membranes is an important factor in the process of
a. cytoplasmic flow
b. mitotic division
c. homeostatsis
d. nuclear transfer
Answer: c. homeostatsis
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All of the following nucleotide bases are pyrimidines EXCEPT
A. adenine. B. thymine. C. cytosine. D. uracil. E. cytosine and thymine.
The Intergovernmental Panel on Climate Change reported in 2007 that atmospheric carbon dioxide levels will nearly double by the end of this century. If this happens, what will be the atmospheric concentration of carbon dioxide?
A. 1.5 ppm B. 1.75 ppm C. 385 ppm D. 560 ppm E. 700 ppm
Introduction of previously nonexistent genes into a population may be accomplished by
a. nonrandom mating. b. mutation. c. sexual recombination. d. the founder effect. e. birth.
Human use of ecosystems
A. is in harmony with natural ecosystems. B. increases the number of animals present. C. requires the alteration of previously existing ecosystems. D. does not occur.