17. The primary purpose of the passage is to
offer an analysis of metabolic processes
detail the ways in which bacteria and fungi can be inhibited
describe mechanisms by which the skin protects itself against pathogens
analyze the methods whereby biological systems maintain the status quo
provide a specific example of the skin s basic defenses against pathogens
18. The resident flora mentioned in line 16 refer to
Unsaturated fatty acids
sebum collected from the skin surface
bacterial and fungal cutaneous pathogens
certain gram-positive members of the cutaneous community
more complex lipids
19. Among the natural defenses of the skin against pathogenic organisms are all of the following EXCEPT the
dryness of the skin
acidity of the skin
tendency of the pathogens toward homeostasis
shedding of surface layers of the skin
metabolic breakdown of lipids
20. The author presents her material in which of the following ways?
Stating a problem and then supplying a solution
Presenting a phenomenon and then analyzing reason for it
Providing information and then drawing a conclusion from it
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