Algae can cause health problems because
A) they are parasitic.
B) they inhabit animal tissues preferentially.
C) they may produce toxins.
D) all of the above are true.
Ans: C) they may produce toxins.
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Two Australian animals, the spiny anteater and the platypus, both ________
a. have become invasive species on other continents b. went extinct recently due to habitat degradation c. are marsupials d. are monotremes
Investigators using molecular techniques determined that the rapid spread of armadillos into the
southern U.S. was due to ____.
a. territorial sires driving out male offspring b. a 92 percent reproduction rate c. extensive migration of individuals d. unexplained reasons e. hunting pressure
Why do lymph nodes swell during an
infection?
a. Macrophages accumulate in them. b. Bacteria accumulate in them. c. T cells accumulate in them. d. Production of lymphatic fluid increases. e. Production of mucous increases
The leukocytes called natural killer lymphocytes
A. release prostaglandins and leukotrienes in response to microbes. B. increase in allergies and helminth infection. C. respond to the coating of a pathogen by complement. D. are nonspecific leukocytes that secrete toxins onto the surface of virus-infected cells. E. are specialists in killing bacteria.