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Antibody Structure and Diversity quiz

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  • What is the basic structure of an antibody?
    An antibody is Y-shaped and composed of two heavy chains and two light chains.
  • Where are the antigen-binding sites located on an antibody?
    The antigen-binding sites are located at the tips of the Y structure, involving both the heavy and light chains.
  • What are the five classes of antibodies based on?
    The five classes are based on the type of heavy chain present: IgM, IgD, IgA, IgE, and IgG.
  • Which antibody classes are membrane-bound and not secreted?
    IgM and IgD are membrane-bound and not secreted.
  • What is the main function of antibodies?
    Antibodies mark pathogens for destruction by binding to specific antigens.
  • How do antibodies achieve high specificity for antigens?
    They have variable regions in their light and heavy chains that are unique to each antibody, allowing specific antigen recognition.
  • What is VDJ recombination?
    VDJ recombination is a process that shuffles variable (V), diversity (D), and joining (J) gene segments to create diverse antigen-binding sites.
  • Why can't the genome encode every possible antibody directly?
    There isn't enough space in the genome to encode every possible antibody, so diversity is generated through recombination and mutation.
  • What is somatic hypermutation?
    Somatic hypermutation is a process where mutations occur at a high rate in the variable regions of antibody genes in B cells, increasing diversity.
  • What is class switching in B cells?
    Class switching is when a B cell changes the type of antibody it produces (e.g., from IgM to IgE) to adapt to different immune responses.
  • What regions are found on both the heavy and light chains of antibodies?
    Both chains have constant regions (same within a class) and variable regions (unique to each antibody).
  • What are hypervariable regions in antibodies?
    Hypervariable regions are small segments within the variable regions where the antigen makes most of its contacts, providing high specificity.
  • How many types of light chains exist, and are they functionally different?
    There are two types of light chains, but they are virtually indistinguishable and functionally similar.
  • What type of bonds do antibodies use to bind antigens?
    Antibodies bind antigens using non-covalent bonds.
  • What is the primary antibody repertoire, and which classes does it include?
    The primary antibody repertoire consists of IgM and IgD, which are the first antibodies produced by B cells and are membrane-bound.