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Questions and Answers

What affects the strength of the bond between an antigen and a binding site?

  • The temperature of the assay
  • The size of the antigen
  • The type of antibody used
  • The resemblance of the cross-reacting antigen to the original antigen (correct)
  • How is affinity related to the sensitivity of an assay reaction?

  • Higher affinity decreases sensitivity
  • Affinity does not affect the sensitivity of an assay
  • Higher affinity results in more visible complexes (correct)
  • Higher affinity leads to fewer complexes formed
  • What is avidity in the context of immunology?

  • The characteristic of an antibody to only bind one antigen
  • The maximum temperature an assay can reach
  • The strength of a single antibody's bond to an antigen
  • The overall binding strength of multivalent antibodies to multivalent antigens (correct)
  • Which antibody type has the highest potential binding sites for antigens?

    <p>IgM</p> Signup and view all the answers

    What does the law of mass action state in relation to antigen-antibody binding?

    <p>Free reactants are in equilibrium with bound reactants</p> Signup and view all the answers

    What mainly determines the affinity of an antibody to an antigen?

    <p>Molecular attractions and three-dimensional fit</p> Signup and view all the answers

    Which statement is true about the monomers in IgM?

    <p>They can swing up or down to improve antigen binding.</p> Signup and view all the answers

    What does a higher equilibrium constant indicate in antigen-antibody reactions?

    <p>Higher rate of the forward reaction compared to the reverse</p> Signup and view all the answers

    What common outcome can result from the interaction of pollens with IgE?

    <p>Development of an asthma attack</p> Signup and view all the answers

    What is one characteristic of tertiary binding tests in immunology?

    <p>They measure complex immune reactions in vivo.</p> Signup and view all the answers

    In which decade was the enzyme immunoassay (EIA) developed?

    <p>1970s</p> Signup and view all the answers

    What is a major benefit of using enzymes in EIA?

    <p>They can amplify signals based on catalytic activity.</p> Signup and view all the answers

    Which method is NOT typically associated with immunoassays?

    <p>Nucleic acid hybridization</p> Signup and view all the answers

    What is a result of precipitation immunoassays?

    <p>Soluble antigen-antibody complexes producing visible precipitate</p> Signup and view all the answers

    Which assessment is true about agglutination in immunoassays?

    <p>It involves particulate antigens clumping together.</p> Signup and view all the answers

    What was a major focus of research following the development of RIA?

    <p>Finding safer nonisotopic labels</p> Signup and view all the answers

    What are the two key characteristics of antibodies that influence antigen-antibody binding?

    <p>Affinity and Avidity</p> Signup and view all the answers

    Which of the following correctly describes affinity in relation to antibody activity?

    <p>The initial force of attraction between a Fab site and a single epitope</p> Signup and view all the answers

    Which type of bond is NOT included in the noncovalent interactions that hold antigen-antibody complexes together?

    <p>Covalent bonds</p> Signup and view all the answers

    What term refers to the ability of an antibody to react with antigens that are structurally similar to the original antigen?

    <p>Cross-reactivity</p> Signup and view all the answers

    Which body fluid is primarily used in serological tests?

    <p>Serum</p> Signup and view all the answers

    How is the stability of antigen-antibody complexes influenced?

    <p>By the affinity and avidity of the antibody</p> Signup and view all the answers

    What range do the noncovalent interactions between antibodies and antigens primarily occur?

    <p>1x10–7 mm</p> Signup and view all the answers

    What is the primary purpose of immunoassays in the clinical laboratory?

    <p>To detect the presence of specific antigens or antibodies</p> Signup and view all the answers

    Which of the following is NOT a type of molecule that immunoassays can detect?

    <p>Nucleic acids</p> Signup and view all the answers

    What characteristic is important for antigen-antibody binding to be stable?

    <p>The shape fit between epitope and binding site</p> Signup and view all the answers

    What is the primary purpose of using fluorophores in fluorescent immunoassays (FIA)?

    <p>To provide a detectable emission light upon excitation</p> Signup and view all the answers

    What type of particles are commonly used as carriers in fluorescent immunoassays?

    <p>Erythrocytes, latex, or metals</p> Signup and view all the answers

    What was a key contribution of Yalow and Berson's development of radioimmunoassay (RIA) in 1959?

    <p>Quantitative detection of trace levels of analytes</p> Signup and view all the answers

    What can decrease the sensitivity of fluorescent immunoassays?

    <p>Nonspecific background fluorescence</p> Signup and view all the answers

    What improvement in fluorescent immunoassays has been noted due to the introduction of a new class of fluorescent compounds?

    <p>Elimination of background noise</p> Signup and view all the answers

    What is the primary concern with using background fluorescence in biological specimens during FIA?

    <p>It can mask the signals from the fluorophores</p> Signup and view all the answers

    What concentration level can sophisticated instrumentation detect using fluorescent immunoassays?

    <p>10-15 M</p> Signup and view all the answers

    Which of the following statements about agglutination in FIA is true?

    <p>It forms as a result of immune reactions between antigens and antibodies</p> Signup and view all the answers

    What does avidity measure in the context of antigen-antibody interactions?

    <p>The overall stability of the antigen-antibody complex</p> Signup and view all the answers

    Why does IgM have a higher avidity compared to IgG?

    <p>It has the ability to bind to 10 different antigens.</p> Signup and view all the answers

    What is the equilibrium constant Keq indicative of?

    <p>The tendency of antigen-antibody complexes to dissociate</p> Signup and view all the answers

    Which of the following is a characteristic of secondary reactions in antigen-antibody interactions?

    <p>They require electrolytes to take place.</p> Signup and view all the answers

    What distinguishes primary binding assays from secondary binding tests?

    <p>Primary binding assays are the most sensitive tests.</p> Signup and view all the answers

    Which one of the following types of secondary reactions involves the clumping of particulate antigens?

    <p>Agglutination</p> Signup and view all the answers

    In the context of antigen-antibody interactions, what does the term contact area refer to?

    <p>The region at which antibodies and antigens physically interact</p> Signup and view all the answers

    What primary function do labels serve in immunoassays?

    <p>To allow for visualization of the reaction</p> Signup and view all the answers

    How does increasing avidity impact the formation of antigen-antibody complexes?

    <p>It increases the stability of the complexes.</p> Signup and view all the answers

    What typically occurs during tertiary reactions of antigen-antibody interactions?

    <p>Biologic expressions occur as a result of the interaction.</p> Signup and view all the answers

    Which immunoassay uses radioisotopes as labels?

    <p>Radioimmunoassay</p> Signup and view all the answers

    Which of the following best describes monovalent antibodies?

    <p>They cannot interact on multiple antigenic sites.</p> Signup and view all the answers

    What is the effect of high affinity antibodies when used in conjunction with high avidity?

    <p>They enhance the sensitivity of the immunoassay.</p> Signup and view all the answers

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