Rats
a. are carriers of human pathogens.
b. spread bubonic plague via infected fleas.
c. infest rice fields, significantly reducing the
yield.
d. cause billions of dollars of annual economic
loss.
e. do all of these.
Answer: e
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A. 1:1 B. 2:1 C. 3:1 D. 1:2:1
You treat an organism with a drug that inhibits calcium permeability in nerve cells specifically. As a result, you expect to see
A) no depolarization of membranes. B) no repolarization of membranes. C) failure to achieve the threshold necessary to stimulate a signal. D) presynaptic neurotransmitter release. E) no postsynaptic receptors.
All of the following statements are true
concerning mycorrhizae EXCEPT that a. the fungus may penetrate into root cells. b. mycorrhizae increase the surface area for absorption. c. roots obtain minerals from the fungus. d. the fungus provides the plant with nitrogenrich compounds. e. it is a mutualistic symbiosis
Which of the following is part of the mitotic spindle?
A. sister chromatid B. centromere C. nucleolus D. aster E. nuclear membrane