B-Cell Activation and Anergy
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Questions and Answers

Which stage of B-cell development involves the rearrangement of heavy and light chains, and the roles of RAG-1, RAG-2, and TdT?

  • Mature B-cells
  • Activated B-cells
  • Naïve B-cells
  • Immature B-cells (correct)
  • What is the consequence of failure to achieve central and peripheral tolerance in B-cells?

  • Enhanced B-cell activation
  • Increased affinity maturation
  • Autoimmune diseases (correct)
  • Decreased somatic hypermutation
  • Which cell type is responsible for producing antibodies at the highest level during a secondary immune response?

  • Plasma cells (correct)
  • Naïve B-cells
  • Immature B-cells
  • Memory B-cells
  • What is the primary function of activation-induced cytidine deaminase (AID) in B-cell activation and differentiation?

    <p>Promoting somatic hypermutation</p> Signup and view all the answers

    How does the response of a B-cell to a T-independent antigen differ from the response to a T-dependent antigen?

    <p>T-dependent antigens require helper T cells for activation</p> Signup and view all the answers

    What is the main function of B-1 cells?

    <p>Preferentially respond to T-independent antigens</p> Signup and view all the answers

    Where does the development of B cells occur?

    <p>Bone marrow</p> Signup and view all the answers

    Which chromosome contains about 60 Variable (V) regions for heavy chain locus?

    <p>Chromosome 14</p> Signup and view all the answers

    What is the process by which B cells recombine the antibody heavy chain genes to use with other constant (C) genes?

    <p>Immunoglobulin class switching</p> Signup and view all the answers

    Which cytokines promote the differentiation of B cells into plasma cells and class switching to IgG2, IgG4, IgA, and IgE?

    <p>Interleukin-4 (IL-4), Interleukin-5 (IL-5), and Transforming Growth Factor-beta (TGF-β)</p> Signup and view all the answers

    Which surface marker characterizes early Pro-B cells in the B cell lineage?

    <p>CD19</p> Signup and view all the answers

    What is the main event in the early Pro-B cell stage?

    <p>Rearrangement of the heavy chain immunoglobulin genes</p> Signup and view all the answers

    What complex is formed when the heavy chain, surrogate light chain, Ig, and Igβ associate with the BCR to resemble the BCR?

    <p>Pre-B cell receptor</p> Signup and view all the answers

    Which process ensures that a B cell only expresses one of its two copies of the heavy chain genes?

    <p>Allelic exclusion</p> Signup and view all the answers

    What occurs when a functional light chain is formed in pre-B cells?

    <p>RAG gene transcription stops</p> Signup and view all the answers

    What triggers an immature self-reactive B cell to become anergic?

    <p>Down-regulation of IgM expression</p> Signup and view all the answers

    Which cytokines are involved in B-cell activation?

    <p>IL-1, IL-4, IL-6, and IFN</p> Signup and view all the answers

    What is the main function of memory B cells?

    <p>Rapidly reactivate upon subsequent encounter with specific antigens</p> Signup and view all the answers

    Which surface molecule triggers the activation and division of B cells when bound to CD40L?

    <p>CD40</p> Signup and view all the answers

    What type of antigens can activate B cells without requiring T cell help?

    <p>Thymus-independent antigens such as bacterial polysaccharides</p> Signup and view all the answers

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