Which of the following situations might cause normal microbiota to become opportunistic pathogens?
A) growth of microbes on the surface of intact skin
B) growth of microorganisms on the excreted cellular wastes and dead cells in the large intestine
C) treatment of a cancer patient with radiation
D) growth of Lactobacillus on the surface of teeth
E) presence of Entamoeba in the lumen of the colon
C
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Classical conditioning and operant conditioning differ in that they apply, respectively, to ____ and ____ behavior
a. voluntary; involuntary b. involuntary; voluntary c. instinctive; learned d. learned; instinctive e. active; passive
A characteristic of land plants is the presence of small openings, found mostly on the underside of leaves, that allow gas exchange between the plant and its environment. These structures are called
A. stomata. B. chloroplasts. C. thallus. D. rhizoids. E. cuticles.
The life history traits favored by selection are most likely to vary with
A) fluctuations in K. B) the shape of the J curve. C) the maximum size of a population. D) population density. E) population dispersion.
It has been estimated that as many as ________ of the Bacteria in seawater are killed by bacteriophages each day
a. 5 percent b. 10 percent c. 50 percent d. 90 percent