PreQuiz


1	Which one of the following choices is of the first lines of defense against infection for humans?
	A)	White blood cells
	B)	Skin
	C)	Interferon
	D)	Natural killer cells

2	Transient microorganisms are less associated with the skin than resident microorganisms.
	A)	True
	B)	False

3	Resident flora of the skin tends to fluctuate over time.
	A)	True
	B)	False

4	Why is it easy to predict resident microbes of the skin?
	A)	They are always gram-negative.
	B)	They are always prokaryotic.
	C)	They are always anaerobic.
	D)	They consist of organisms that have become adapted to a very specific environment.

5	How are resident nonpathogenic Staphylococci beneficial?
	A)	They compete with pathogens for nutrients and produce inhibitory substances.
	B)	They change the pH of the skin.
	C)	They secrete antibodies.
	D)	They phagocytose pathogenic strains of bacteria.

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