Functions of Immunoglobulin Fc Fragment
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Questions and Answers

What is the molecular weight of IgD?

  • 180,000
  • 200,000 (correct)
  • 150,000
  • 385,000
  • Which immunoglobulin is responsible for releasing histamine from basophils and mast cells?

  • IgA
  • IgG
  • IgM
  • IgE (correct)
  • Which immunoglobulin can serve as a B-cell receptor?

  • IgG
  • IgD (correct)
  • IgM
  • IgA
  • Which immunoglobulin is involved in opsonization?

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

    Which immunoglobulin has 10 antigen-binding sites?

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

    What is the percentage of total antibody in serum for IgE?

    <p>0.002%</p> Signup and view all the answers

    What is the primary signal that a molecule is foreign?

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

    Which chemical category includes materials like enzymes, cell surface structures, hormones, and exotoxins?

    <p>Proteins and polypeptides</p> Signup and view all the answers

    What are haptens made up of?

    <p>Determinant group only</p> Signup and view all the answers

    In general, what characteristic makes large antigens considered better than small antigens?

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

    What role do glycoproteins play in the immune response?

    <p>They mark blood cell antigens</p> Signup and view all the answers

    What must be done to a hapten for it to develop immunogenicity?

    <p>Link it to a carrier group</p> Signup and view all the answers

    What is the main function of the Fab fragment of an immunoglobulin?

    <p>It binds antigens</p> Signup and view all the answers

    Which of the following is NOT a function of the Fc fragment of an immunoglobulin?

    <p>Neutralizing antigens</p> Signup and view all the answers

    What is the process where antibodies mark pathogens for destruction by phagocytic cells?

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

    In blood transfusion or organ grafting, which molecules are responsible for incompatibilities between individuals?

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

    Which of the following is a characteristic of superantigens?

    <p>They can lead to a cytokine storm</p> Signup and view all the answers

    Which cell type is responsible for formally presenting antigens to antigen-presenting cells (APCs)?

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

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