Loams are soils with the best water and oxygen
penetration because they have
a. a high proportion of sand.
b. a high proportion of silt.
c. a high proportion of clay.
d. high proportions of sand and silt and a low
proportion of clay.
e. equal proportions of sand, silt, and clay.
Answer: e
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Overproduction of the mineralocoticoid ______ causes excessive water retention
a. cortisol b. aldosterone c. epinephrine d. catecholamine e. ADH
A small group of islanders leave "island A" and travel to "island B." After several generations on island B, a researcher finds that a large percentage of the population is left-handed. Left-handedness is a relatively rare trait on island A. A genetic event that explains this is
A) a population bottleneck. B) genetic load. C) a founder effect. D) natural selection.
In which of the following cases would DNA
profiling be used?
a. to reconstruct population dispersals b. to identify the remains of dead people c. to solve crimes d. to trace ethnic hertiages e. to do all of these
RNA can be used as a template for the production of DNA through the action of ____.
A. DNA polymerase B. RNA polymerase C. reverse transcriptase D. ligase E. restriction endonuclease