Anatomy of Antibodies
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Questions and Answers

Which of the following is the correct definition of an antibody (Ig)?

  • A molecule that is involved in the recognition and deletion of antigens
  • A glycoprotein molecule that can recognize and bind to an immunogen (correct)
  • A protein molecule produced by plasma cells in response to an immunogen
  • A molecule found in extracellular fluids and on the surface of B cells
  • What is the function of BCR (B cell receptor) antibodies?

  • Antigen recognition and B cell activation (correct)
  • Antigen recognition and antibody production
  • Antigen recognition and B cell deletion
  • Antigen recognition and effector functions
  • Where are antibodies found in the body?

  • Intracellular vesicles and lysosomes
  • Cytoplasm and nucleus of plasma cells
  • Extracellular fluids and on the surface of B cells (correct)
  • In the bloodstream only
  • What is the origin of the name 'antibody' or 'immunoglobulin'?

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    What percentage of total protein in the body are antibodies?

    <p>20%</p> Signup and view all the answers

    Study Notes

    Antibody Definition

    • An antibody, also known as immunoglobulin (Ig), is a glycoprotein produced by plasma cells that identifies and neutralizes pathogens like bacteria and viruses.

    Function of BCR Antibodies

    • B cell receptors (BCR) are specific antibodies on the surface of B cells that recognize antigens, initiating the immune response.
    • BCRs play a crucial role in the activation and differentiation of B cells, leading to the production of more antibodies.

    Location of Antibodies in the Body

    • Antibodies are primarily found in blood plasma but are also present in other bodily fluids such as lymph and saliva, as well as in mucosal secretions.

    Origin of the Name 'Antibody' or 'Immunoglobulin'

    • The term 'antibody' originates from their function in binding to antigens, with 'immunoglobulin' reflecting their role in the immune system as globular proteins that mediate immune responses.

    Percentage of Total Protein Represented by Antibodies

    • Antibodies account for approximately 20% of total protein in serum, indicating their significant presence and function in the immune system.

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    Description

    Test your knowledge of antibody structure and production with this quiz. Learn about the definition of antibodies, their antigen recognition abilities, and the origin of their name. Explore the role of immunoglobulins and their different regions.

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