Water distribution systems contain
A) very few bacteria or other microorganisms.
B) biofilms that may harbor opportunistic pathogens.
C) numerous grazing protists that consume bacteria.
D) biofilms that may harbor opportunistic pathogens and numerous grazing protists that consume bacteria.
Answer: D
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The arrangement of organisms into groups is best described as ________.
A. identification B. taxonomy C. classification D. systematics
Which of the following inaccurately represents normal forces across capillary walls?
A) Interstitial fluid oncotic pressure is almost zero. B) At rest, net filtration occurs across capillary walls. C) Interstitial fluid hydrostatic pressure increases from arteriole end to venous end. D) Capillary hydrostatic pressure decreases from arteriole end to venous end. E) Capillary oncotic pressure is due primarily to plasma proteins.
The sperm in the figure below were most likely produced by:
a. nondisjunction.
b. mutation.
c. X-linkage.
d. translocation.
e. normal meiosis.
Pneumocystis jirovecii
A. lacks ergosterol in its plasma membrane. B. has protozoan and fungal characteristics. C. is an obligate parasite. D. causes serious infection in elderly, premature infants, and AIDS patients. E. All of the choices are correct.