When measuring membrane potential, the tip of a microelectrode is inserted into a(n)
a. axon.
b. node of Ranvier.
c. Schwann cell.
d. dendrite.
e. glial cell.
A
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Which one of the following is the external structure of the ear that enhances reception of sound waves?
A. tympanic membrane B. oval window C. cochlea D. pinna
Pyrrhocoris apterus, or firebug, is native to Europe and China, and eats the seeds of lime trees and mallow trees
What is the most likely explanation for the fact that a native North American species, the fir tree, synthesizes a compound that disrupts development of this European insect? A. The fir tree benefits from this compound because its effect on the firebug decreases competition for resources in its natural environment. B. The fir tree benefits from this compound because its effect on the firebug increases the survival of fir tree offspring. C. The fir tree benefits from this compound because its effect on the firebug increases predation pressure on its competition. D. The fir tree benefits from this compound because its effect on the firebug increases the survival of other, related members of the same species. E. There is likely strong similarity in the hormone receptors of different insects so that a compound made by a tree native to North America has an effect on an insect native to Europe.
Tris-BP was banned after the discovery that the chemical caused cancer in test animals and was ____________________ through the ____________________ by those wearing treated clothing
Fill in the blank(s) with correct word
Answer the following questions in reference to the four geologic periods listed below.
A. Asteroid impact at the K-T boundary caused extinctions. B. Human practices are the major agents of extinction. C. D. Volcanic activity in what is now Siberia released a large amount of carbon into the atmosphere causing extinctions. E. Oceans became anoxic, and methane burned on land. F. The greatest mass extinction event where 90 to 95 percent of all species were lost