_______ biogeography studies the current factors affecting the distribution of plants and animals.
a) Ecological
b) Historical
c) Zoological
d) Conservation
Ans: a) Ecological
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Many mosquito populations today are resistant to pesticides that were historically effective. This pesticide resistance arose in these populations because
a) the pesticides caused mutations in the DNA of mosquitoes that conferred resistance phenotypes, and these mutations were passed on to subsequent generations b) populations had to develop tolerance in order to survive c) individual mosquitoes build up immunity to the pesticides after exposure d) some individuals were resistant to the pesticides before they were used, and those mosquitoes were more likely to survive and reproduce e) these populations were outside the range of the original pesticide application
Being born with extra fingers on a hand is called polydactyly. This is more common in some populations in North America than others due to ________.
A. random mating with other populations in North America B. natural selection in favor of extra fingers in these populations C. a founder effect because their ancestors from Europe carried the alleles D. migration of people with multiple fingers out of the population E. an increase in mutation rate in these populations
____ code(s) for the placement of one amino acid.
A. Three codons B. One nucleotide C. Three nucleotides D. One intron
Loss of water from the aerial parts of plants is called _____
A) dehydration B) high heat of vaporization C) respiration D) gas exchange E) transpiration