The ________ is the zone near the shore of a lake where a diverse group of organisms lives and where light and nutrients are abundant
A) profundal
B) stratification
C) phytoplankton
D) littoral
E) limnetic
D
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Indicate whether the statement is true or false
Which of the following statements about Neisseria gonorrhoeae is FALSE?
A. It causes disease in humans only. B. The gonococci stick to epithelial cells via fimbriae and capsules. C. The gonococci secrete a protease that destroys secretory IgA. D. The gonococci induce lasting immunity. E. Infected women are often asymptomatic.
A gram-negative bacillus that is hydrogen sulfide (H2S)-positive, citrate-positive, spot in-dole–negative, and associated with gastroenteritis in the United States is most likely:
a. K. pneumoniae. b. P. vulgaris. c. Salmonella enteritidis. d. S. sonnei.
When nitrate is reduced to dinitrogen gas (N2), nitrogen is removed from the ecosystem and returned to the atmosphere through a series of reactions collectively known as ________.
A. denitrification B. nitrogen fixation C. anammox reaction D. All of the choices are correct.