Antigen Structure, Processing and Presentation by Dr. Muna Oqal
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Questions and Answers

Which of the following is NOT a characteristic of high molecular weight antigens?

  • Are usually non-protein substances
  • May be proteins or polysaccharides
  • Can induce immune response on their own (correct)
  • Require carrier molecules to induce an immune response
  • What is the term used to describe the immunologically active regions of an immunogen that bind to antigen-specific receptors on lymphocytes?

  • Carrier molecules
  • Epitopes (correct)
  • Determinants
  • Globulins
  • Why are parenteral routes of administration more immunogenic compared to the oral route?

  • They have larger molecules
  • They have a higher molecular weight
  • They contain stable molecules
  • They allow direct access to lymphocytes (correct)
  • What is the main property that makes a molecule more effective as an antigen?

    <p>Being a stable molecule</p> Signup and view all the answers

    What is the role of carrier molecules in relation to incomplete antigens or haptens?

    <p>Make incomplete antigens complete antigens</p> Signup and view all the answers

    Which characteristic does NOT contribute to the antigenicity of a molecule?

    <p>Small molecular mass between 5000 and 100,000 daltons</p> Signup and view all the answers

    What is the main characteristic of an immunogen?

    <p>It causes the generation of antibodies</p> Signup and view all the answers

    Which of the following is NOT a type of antigen according to the text?

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

    What is the role of Major Histocompatibility Complex (MHC) in antigen presentation?

    <p>It presents antigens to T cells</p> Signup and view all the answers

    Which statement accurately describes haptens?

    <p>Haptens only become immunogenic when coupled with carrier molecules</p> Signup and view all the answers

    What is the distinguishing feature of a Complete Antigen or Immunogen?

    <p>It possesses antigenic properties on its own</p> Signup and view all the answers

    Which of the following is an example of an antigen formed within the body?

    <p>Bacterial toxins</p> Signup and view all the answers

    What is the term used to describe the small area on the antigen molecule that reacts specifically with antibodies?

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

    Which cells are responsible for trapping viral antigens in the body fluids?

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

    Which type of antigenic determinants are mainly recognized by T cells?

    <p>Linear determinants</p> Signup and view all the answers

    What process mainly mediates the uptake of exogenous antigens by APCs?

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

    Which type of immunogens are nucleic acids considered to be?

    <p>Poorly immunogenic</p> Signup and view all the answers

    Which of the following is an example of endogenous antigens?

    <p>Antigens generated within cells due to infection</p> Signup and view all the answers

    Which type of human tissue antigens include Major Histocompatibility Complex (MHC) molecules?

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

    What type of antigens are exogenous antigens?

    <p>Antigens from outside the body</p> Signup and view all the answers

    Which of the following is a type of bacterial antigen related to bacterial cells?

    <p>Capsular antigen</p> Signup and view all the answers

    What can some exogenous antigens transform into, after entering the body?

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

    Why are lipids generally considered non-immunogenic?

    <p>They lack antigenic determinants</p> Signup and view all the answers

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