Legionella is an opportunistic pathogen that has recently emerged as a public health risk associated with water handling systems. Why?
a. It is resistant to common disinfectants.
b. It forms biofilms that make it hard to clear from a system.
c. It can reside and replicate in protozoa.
d. Both a and b are correct.
Answer: C
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Many prokaryotes can switch between using aerobic respiration and fermentation depending on oxygen availability; these organisms are termed which of the following?
a. obligate anaerobes b. facultative anaerobes c. necessary anaerobes d. facultative aerobes
The theory of continental movement is called ____
a. plate tectonics b. plate drift c. seismology d. fault line movement e. sea floor spreading
Which of the following statements is (are) true?
a. All action potentials transmitted by the same neuron are alike. b. The brain assesses a stimulus in part by which neuron pathways are active. c. Different neurons convey different information by transmitting impulses to different areas of the brain. d. A strong stimulus recruits more receptors than does a weak stimulus. e. All of these are true.
What is the name of the paired excretory organs found in most body segments of segmented worms?
a. parapodia b. metanephridia c. setae d. clitella