Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.
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1.
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The
body’s first line of defense against infection includes all of the following
except a. | skin. | c. | acids in the
stomach. | b. | mucous membranes. | d. | interleukin-1. | | | | |
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2.
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Which
of the following pairs is incorrectly associated? a. | cytotoxic T
cells—attack and kill infected cells | b. | helper T cells—activate cytotoxic T cells and B
cells | c. | B cells—engulf cells that are infected with
microbes | d. | macrophages—consume pathogens and infected
cells | | |
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3.
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Once
stimulated by antigens on the surface of macrophages, helper T cells may a. | stimulate
cytotoxic T cells to attack viruses directly. | b. | stimulate B
cells to divide and develop into plasma cells. | c. | repair
macrophages. | d. | cause fever. | | |
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4.
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The
Y-shaped molecule that is produced by plasma cells upon exposure to a specific antigen and can bind
to that antigen is called a(n) a. | helper T cell. | c. | B cell. | b. | macrophage. | d. | antibody. | | | | |
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5.
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Which
of the following is not one of Koch’s postulates? a. | When the
isolated pathogen is injected into the healthy animal, the animal must develop the
disease. | b. | The pathogen must be found in an animal with the disease and
not in a healthy animal. | c. | The healthy animal must be shown to be susceptible to the
pathogen before it is injected with the disease. | d. | The pathogen
must be isolated from the sick animal and grown in a laboratory culture. | | |
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6.
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HIV
causes AIDS by attacking and destroying a. | helper T cells. | c. | neutrophils. | b. | B
cells. | d. | antibodies. | | | | |
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