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Genetic characteristics of the human species that protects the body from certain pathogens
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chemical barriers
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microbial flora
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species resistance
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mechanical barriers
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An immunoglobulin, or antibody molecule, consists of
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two heavy and two light polypeptide chains
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four heavy and two light polypeptide chains
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two heavy and four light polypeptide chains
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four heavy and four light polypeptide chains
Frage 3
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All of the following represent examples of nonspecific immune defenses except
Frage 4
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The most abundant circulating antibody, the one that normally makes up about 75% of all the antibodies in the blood, is
Frage 5
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A large antibody with 10 binding sites
Frage 6
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Which of the following can activate a naive B cell
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Binding to its specific antibody
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Binding to its specific antigen
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All B cells are activated when an infant is born
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All of the above
Frage 7
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Which of the following is not a characteristic of inflammation?
Frage 8
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15% of the lymphocytes are made of these nonspecific killer cells:
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helper T cells
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cytotoxic T cells
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B cells
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NK cells
Frage 9
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The amount of antibodies in a person’s blood is expressed as:
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toxoid
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titer
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both toxoid and titer
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none of the above
Frage 10
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The type of immune mechanism that provides a general defense by acting against anything recognized as “not self” is called
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nonspecific immunity
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specific immunity
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adaptive immunity
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acquired immunity
Frage 11
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The MHC antigen is important in helping the immune system identify [blank_start]self[blank_end] [blank_start]cells[blank_end].
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The complement system can be activated by
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the binding of complement protein 1 to the complement-binding site on the antibody molecule.
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the binding of complement protein 3 to bacteria or viruses in the presence of properdin.
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nonspecific immune mechanisms
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all of the above
Frage 13
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In the first stage of their development, B cells are known by following term: plasma B cells.
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Complement system is not a chemical barrier
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This substance can destroy pathogens by lowering the pH to a level where they cannot function: [blank_start]Hydrochloric[blank_end] [blank_start]acid[blank_end]
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Memory B cells form plasma B cells upon rexposure to same antigen.
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The antibody commonly found in tears, saliva and on mucous membranes is [blank_start]IgA[blank_end].
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Pyrogens play an important role in raising the thermostat and triggering fever.
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Specific immunity is controlled by two classes of lymphocytes called [blank_start]T[blank_end] [blank_start]cells[blank_end] and [blank_start]B[blank_end] [blank_start]cells[blank_end].
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The most numerous type of phagocyte is the [blank_start]neutrophil[blank_end].
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John was immunized against most of the childhood diseases. What type of immunity results:
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Also known as killer lymphocytes