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Ch. 21 Online quiz

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nessaram994's version from 2017-10-22 18:08

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Question Answer
Complement proteins and antibodies coat a microorganism and provide binding sites, enabling macrophages and neutrophils to phagocytize the organism. This phenomenon is termed ________. a. diapedesis b. opsonization c. chemotaxis d. agglutination b. opsonization
Which of the following statements is incorrect? a. Class II MHC molecules are built into the plasma membranes of all body cells. b. Haptens lack immunogenicity unless attached to protein carriers. c. Class I MHC molecules are built into the plasma membranes of all body cells. d. MHC proteins are the cell's identity markers.a. Class II MHC molecules are built into the plasma membranes of all body cells.
Fever ________. a. is a higher-than-normal body temperature that is always dangerous b. causes the liver to release large amounts of iron, which seems to inhibit bacterial replication c. decreases the metabolic rate of the body to conserve energy d. production is regulated by chemicals that reset the body's thermostat to a higher setting d. production is regulated by chemicals that reset the body's thermostat to a higher setting
B cells respond to the initial antigen challenge by ________. a. producing progeny cells that include plasma cells and memory cells b. immediately producing antigen-specific antibodies c. reducing its size d. forming of a large number of cells that are unlike the original B cell a. producing progeny cells that include plasma cells and memory cells
The redness and heat of an inflamed area are due to a local hyperemia caused by ________. a. vasodilation b. complement production c. vasoconstriction d. phagocyte mobilization a. vasodilation
Which of the following statements is false? a. It is our genes, not antigens, that determine what specific foreign substances our immune system will be able to recognize and resist. b. The lymphoid organs where lymphocytes become immunocompetent are called primary lymph organs. All other lymphoid organs are referred to as secondary lymphoid organs. c. After becoming immunocompetent, the naive T cells and B cells are exported to the bone marrow where the encounters with antigens occur. d. T cells and B cells become activated when they bind with recognized antigens.c. After becoming immunocompetent, the naive T cells and B cells are exported to the bone marrow where the encounters with antigens occur.
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