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.

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology

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.

Biology & Microbiology