Transmission of P. shigelloides to humans is by:
a. exposure of disrupted skin and mucosal surfaces to contaminated animal hides.
b. ingestion of contaminated seafood or wa-ter.
c. inhalation of contaminated air.
d. close contact with carriers of the organism.
B
None of these organisms are considered part of the normal human flora; therefore, no carriers are known to exist. Transmission to humans is by ingestion of contaminated water or seafood or by exposure of disrupted skin and mucosal surfaces to contaminated water.
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Epiphytes are non-parasitic plants that grow on other plants
a. True b. False
From the outside of a tree to its center, which of the following is the correct order of appearance?
1. periderm 2. vascular cambium 3. sapwood 4. secondary phloem 5. cork cambium 6. heartwood
a. 1-2-4-5-6-3 b. 1-5-4-2-3-6 c. 1-4-5-2-6-3 d. 1-3-2-5-4-6 e. 1-2-4-5-3-6
_____ are suspensions of fine dust or moisture in the air that contain live pathogens, whereas droplets are dried microscopic residues ejected from the mouth and nose.
Fill in the blank(s) with the appropriate word(s).
Hemoglobin is a(n) ____________________-containing protein in red blood cells. Fill in the blank(s) with the appropriate word(s)