B and T Cell Clones Gene Rearrangement Quiz
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Questions and Answers

What is the phenomenon called when an individual B cell can express an Ig heavy chain protein encoded by only one of the two inherited alleles?

  • Germline configuration
  • Clonal specificity
  • Allelic exclusion (correct)
  • Clonal expansion
  • What is the role of a μ protein produced from the recombined heavy chain locus in forming a pre-BCR?

  • Inhibit rearrangement of the Ig heavy chain locus on the same chromosome (correct)
  • Promote rearrangement of Ig heavy chain locus on the other chromosome
  • Prevent B cell differentiation
  • Stimulate rearrangement of light chain genes
  • What happens if the first rearrangement of the Ig heavy chain locus is non-productive?

  • One allele remains in germline configuration or non-productively rearranged (correct)
  • Both heavy chain alleles complete VDJ rearrangement
  • Alleles switch between chromosomes
  • Clonal deletion occurs
  • At what stage does each developing B cell initially rearrange a κ light chain gene?

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

    Which mechanism ensures that every B cell will express a single receptor?

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

    What is the role of Activation-induced cytidine deaminase (AID) in B cells?

    <p>Initiator of mutations in somatic hypermutation and class switching</p> Signup and view all the answers

    Which process leads to increased antibody affinity during a T-dependent humoral response?

    <p>Somatic hypermutation followed by selective survival of high-affinity B cells</p> Signup and view all the answers

    What happens to the Ig heavy chain DNA in B cells during the class switching process?

    <p>Cut and recombined to place VDJ exon adjacent to a downstream C region</p> Signup and view all the answers

    What type of mutations are generated within the variable region of expressed immunoglobulin genes during somatic hypermutation?

    <p>Point mutations</p> Signup and view all the answers

    In T-dependent responses, what progeny of activated B cells undergo heavy chain isotype switching?

    <p>Progeny of activated IgM- and IgD-expressing B cells</p> Signup and view all the answers

    Which process results in the production of antibodies with heavy chains of different classes like γ, α, and ε?

    <p>Heavy chain isotype switching</p> Signup and view all the answers

    How many separate loci encode all of the Ig heavy chains, the Ig κ light chain, and the Ig λ light chain in humans?

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

    Which of the following is not a true statement about the clonal selection hypothesis?

    <p>The DNA rearrangement events that lead to production of antigen receptors are dependent on or influenced by the presence of antigens</p> Signup and view all the answers

    What is the function of the hypervariable (complementarity-determining) regions in Ig protein domains?

    <p>They determine the specificity of the antigen-antibody interaction</p> Signup and view all the answers

    Which of the following statements about the variable number of C genes at Ig loci is true?

    <p>The number of C genes at each Ig locus is variable</p> Signup and view all the answers

    Which of the following statements about the germline organization of human Ig loci is true?

    <p>The germline organization of Ig genetic loci is characterized by spatial segregation of many different sequences</p> Signup and view all the answers

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