Immunology Mechanisms Overview
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Questions and Answers

Which immunoglobulin isotype does not switch its heavy chain to become another isotype?

  • IgA
  • IgM
  • IgE
  • IgD (correct)
  • What activation factor differentiates naive B cells into IgA-expressing B cells?

  • TGF-ß (correct)
  • IL-1
  • IL-2
  • IL-22
  • How does IgA protect itself from degradation in mucosal fluid?

  • Protected by other complement proteins
  • Indeed, all of these options
  • Gain additional hypermutation
  • Associated with poly-Ig protein (correct)
  • What mechanism do CD8+ T cells use to recognize virus-infected cells?

    <p>Antigen peptide on class-I MHC</p> Signup and view all the answers

    What is the primary role of CD40 activation in antigen-presenting cells (APCs)?

    <p>Full activation</p> Signup and view all the answers

    What process do B cells undergo to increase the affinity maturation of immunoglobulins?

    <p>Hypersomatic mutation</p> Signup and view all the answers

    How do Tfh cells migrate toward follicular tissue to activate B cells?

    <p>Chemokine gradients</p> Signup and view all the answers

    What is a key feature of IgE in the immune response?

    <p>Binds to mast cells and basophils</p> Signup and view all the answers

    Which mechanism is primarily responsible for the switching of immunoglobulin heavy chains?

    <p>Activation-induced deaminase (AID)</p> Signup and view all the answers

    What is the specific role of activation-induced deaminase (AID) during H-chain switching?

    <p>Convert nucleotide C to U and cleavage</p> Signup and view all the answers

    Which immunoglobulin isotype is crucial for the elimination of helminths?

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

    What role does CD8+ T cell play in increasing the number of antigen-specific clones compared to CD4+ T cells during infection?

    <p>Sufficiently kill infected cells</p> Signup and view all the answers

    Which enzyme is responsible for removing nucleotides from VDJ recombinant in junctional diversity?

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

    What process do B cells undergo to enhance affinity maturation of immunoglobulin?

    <p>Hypersomatic mutation</p> Signup and view all the answers

    Which immune component is responsible for neutralizing microbes and their toxins?

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

    Which receptor is involved in the expression of CD28 in T cell activation?

    <p>CD40L</p> Signup and view all the answers

    What is the action mechanism of activation-induced deaminase (AID) in H-chain switching?

    <p>Convert nucleotide C to U and cleavage</p> Signup and view all the answers

    What is the primary role of CD40 activation in antigen-presenting cells (APCs)?

    <p>Full activation</p> Signup and view all the answers

    What is the role of ubiquitin in the class-MHC pathway?

    <p>Tag and transport proteins to proteasome</p> Signup and view all the answers

    Which cytotoxic molecule is secreted by cytotoxic T lymphocytes to kill virus-infected cells?

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

    Why can IgG survive longer compared to other immunoglobulin isotypes?

    <p>Strong Fc domains</p> Signup and view all the answers

    Which enzyme plays a key role in immunoglobulin H-chain switching?

    <p>Activation-induced deaminase (AID)</p> Signup and view all the answers

    During infection, why do antigen-specific clones of CD8+ T cells increase in number more than CD4+ T cells?

    <p>Directly kill infected cells</p> Signup and view all the answers

    Which of the following describes the function of MHC molecules?

    <p>Present antigen peptides to T cells</p> Signup and view all the answers

    How do neonates primarily protect themselves from infections?

    <p>Acquire antibodies from maternal sources</p> Signup and view all the answers

    Which Ig isotype is produced through T-independent activation of B cells?

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

    What factor must activate naive B cells to differentiate into IgA-expressing B cells?

    <p>TGF-ß</p> Signup and view all the answers

    Which type of T helper cell is important in selecting specific Ig-producing B cells in the germinal center?

    <p>Th2 cell</p> Signup and view all the answers

    What characteristic allows IgG to survive longer compared to other Ig isotypes?

    <p>Undergoes affinity maturation</p> Signup and view all the answers

    What role do the complement proteins C3a and C5a play in the immune response?

    <p>They promote inflammation</p> Signup and view all the answers

    Which cytotoxic molecule do cytotoxic T lymphocytes secrete to eliminate virus-infected cells?

    <p>Granzyme B</p> Signup and view all the answers

    Which receptor complex is primarily involved in recognizing pathogen-associated molecular patterns?

    <p>Toll-like receptor</p> Signup and view all the answers

    What is the primary function of the enzyme Ligas during VDJ recombination?

    <p>Repair the broken DNA</p> Signup and view all the answers

    Which B cell subset is specifically involved in somatic hypermutation?

    <p>Follicular B cells</p> Signup and view all the answers

    How do CD8+ T cells primarily differ in their effector function from CD4+ Th cells?

    <p>Kill virus-infected cells</p> Signup and view all the answers

    What role does ubiquitin play in the class-MHC pathway?

    <p>Tag and transport protein to proteasome</p> Signup and view all the answers

    What is the primary purpose of forming the membrane attack complex (MAC) during complement activation?

    <p>Lysis of microbes</p> Signup and view all the answers

    What action mechanism is performed by activation-induced deaminase (AID) during heavy chain switching?

    <p>Convert nucleotide C to U and cleavage</p> Signup and view all the answers

    Among the five immunoglobulin (Ig) isotypes, which one does NOT switch its heavy chain to become another Ig isotype?

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

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