What caused the Dust Bowl of the mid-1930s? What will be an ideal response?
ANSWER: In the mid-1930s, large portions of prairie on the southern Great Plains were plowed under to
plant crops. This plowing exposed the deep prairie topsoil to the force of the region’s
constant winds. Coupled with a drought, the result was an economic and ecological disaster.
Winds carried more than a billion tons of topsoil aloft as sky-darkening dust clouds, causing
the region be known as the Dust Bowl.
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All of the following allow for fast gas exchange EXCEPT
a. more dense medium. b. colder temperatures. c. a steep gradient. d. a large surface area.
Shared homologous structures would indicate that two taxa are:a
outgroups. b. monophyletic. c. polyphyletic. d. homoplastic. e. in different clades.
The specific amino acid sequence of a protein is its ________.
A. primary structure B. tertiary structure C. quaternary structure D. secondary structure
In Southern blotting, DNA fragments on filters must be ____________________ so that probes can
bond with them. Fill in the blank(s) with the appropriate word(s).