Disinfecting agents naturally produced by microorganisms are
A. aldehydes.
B. antibiotics.
C. halogens.
D. quaternary ammonium compounds.
E. triclosan.
Answer: B
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What is the primary anatomical difference that marks the dividing line between the conducting zone and the respiratory zone of the respiratory tract?
A) the absence of goblet cells B) the presence of macrophages C) the presence of smooth muscle and the absence of cartilage D) the absence of cartilage E) the thickness of the walls surrounding the air spaces
A normally functioning muscle cell is in which stage of its cycle?
A. G2 B. anaphase C. G0 D. cytokinesis
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A) inhaling certain fungal spores. B) carbon dioxide inhalation. C) Amanita-induced liver failure. D) ergot poisoning. E) eating too much yeast.
Which of the following factors is primarily responsible for the ability of Mycobacterium tuberculosis to survive long periods of time in dried droplets of respiratory aerosols?
A) production of cord factor B) pyrogenic toxin C) formation of tubercles D) the presence of LPS in the outer membrane E) the presence of mycolic acid in the cell wall