After a person has taken antibiotics to treat a yeast infection in the genitourinary tract, the yeast infection lessens and the microbes that are normally present reestablish themselves. The reason for the lessening of the yeast infection is explained by
A. predation.
B. symbiosis.
C. the competitive exclusion principle.
D. the co-inclusion principle.
E. endosymbiosis.
Answer: C. the competitive exclusion principle.
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The chinook salmon in Lake Ontario has no natural predators; therefore, it is a(n) _______.
a. producer b. primary consumer c. secondary consumer d. apex consumer
Why are conditional knockout animals desirable?
A) Genes that are essential for development can be deleted in the adult or only in specific tissues. B) Animal cell lines with deletions can be created. C) They are easier to create than standard knockout animals. D) The mutations they create are more stable than those created by standard knockout techniques.
Identify the animal that lacks a specialized respiratory organ
A) Bird B) Grasshopper C) Bat D) Trout E) Sponge
The prion disease associated with cannibalism is
a) sheep scrapie. b) kuru. c) mad cow disease. d) chronic wasting disease.