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Introduction to B Lymphocytes quiz

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  • What is the primary role of B lymphocytes (B cells) in the immune system?
    B cells are crucial for adaptive humoral immunity, targeting and destroying extracellular pathogens using antibodies.
  • Where do B cells fully develop in the body?
    B cells fully develop in the bone marrow, which is a primary lymphoid organ.
  • What is the difference between B cell receptors (BCRs) and T cell receptors (TCRs) in antigen recognition?
    BCRs can bind to free-floating antigens, while TCRs can only bind to antigens presented on MHC molecules.
  • What happens to a naive B cell when it encounters its specific antigen?
    The naive B cell internalizes, processes, and presents the antigen on MHC class II molecules for activation by helper T cells.
  • How are B cells activated after antigen presentation?
    Helper T cells recognize the antigen on MHC class II molecules and release cytokines that activate the B cell.
  • Into what two main cell types can activated B cells differentiate?
    Activated B cells can differentiate into memory B cells or plasma cells.
  • What is the function of plasma cells derived from B cells?
    Plasma cells are short-lived effector cells that secrete large amounts of antibodies to combat infections immediately.
  • What is the role of memory B cells?
    Memory B cells are long-lived cells that respond quickly to future infections by the same antigen.
  • How many antigen-binding sites does a typical B cell receptor (BCR) have?
    A typical BCR has two antigen-binding sites.
  • What is the structural relationship between BCRs and antibodies?
    BCRs are membrane-embedded antibodies, and their structure closely resembles the antibodies that plasma cells produce.
  • What is a naive B cell?
    A naive B cell is an inactive B cell that has not yet encountered its specific antigen.
  • What is the main function of antibodies produced by plasma cells?
    Antibodies bind to and help neutralize or eliminate extracellular pathogens.
  • What is the significance of BCRs being 'membrane-embedded antibodies'?
    This means BCRs have a structure similar to secreted antibodies and can bind antigens directly on the B cell surface.
  • What triggers the proliferation and differentiation of B cells?
    Activation by helper T cells after antigen presentation triggers B cells to proliferate and differentiate.
  • How do memory B cells contribute to immunity upon re-infection?
    Memory B cells enable a faster and more effective immune response during subsequent exposures to the same antigen.