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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Mucous membranes a. | are moist epithelial layers that are impermeable to most
pathogens. | b. | line the nasal passages, mouth, lungs, digestive tract,
urethra, and vagina. | c. | contain glands that secrete mucus, a sticky fluid that traps
pathogens. | d. | All of the above | | |
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2.
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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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3.
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A few
B cells that have encountered a pathogen a. | become cytotoxic T cells. | b. | are ingested by
macrophages. | c. | have viral protein on their cell membrane
surface. | d. | become memory cells. | | |
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4.
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B
cells a. | sometimes remain
in the blood for years. | b. | secrete antibodies. | c. | are stimulated
by helper T cells. | d. | All of the above | | |
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5.
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Vaccines are produced from killed or weakened a. | phagocytes. | c. | helper T
cells. | b. | pathogens. | d. | B cells. | | | | |
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6.
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HIV
can be transmitted a. | through sexual intercourse with an infected
person. | b. | by breastfeeding. | c. | by sharing
contaminated hypodermic needles and syringes. | d. | All of the
above | | |
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