Immune System Response Quiz
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Questions and Answers

What is the consequence of T cells recognizing self antigen without costimulatory molecules?

  • They differentiate into memory cells
  • They become activated effector cells
  • They downregulate PD-1 expression
  • They turn on pro-apoptotic proteins (correct)

    • How do tolerant T cells eliminate long-exposed antigens?

  • By upregulating PD-1 expression
  • By rapid proliferation of memory cells
  • By activating effector T cells
  • Through an innate immune response (correct)

    • What is the mechanism by which activated T cells start killing each other?

  • Upregulation of PD-1
  • Downregulation of Fas Ligand
  • Fas-Fas Ligand pathway (correct)
  • Overexpression of costimulatory molecules

    • Why does an antigen persisting for a long time lead to the exhaustion of T cell clones?

    <p>Repeated exposure to the same antigen</p> Signup and view all the answers

    What is the role of PD-1 in the context of persistent antigens?

    <p>Inhibiting T cell activation</p> Signup and view all the answers

    In which scenario do we witness the depletion of memory cells, tolerance, or immunosuppression?

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

    What happens when T cells receive signals from T regulatory cells?

    <p>They induce apoptosis through Fas-Fas Ligand pathway</p> Signup and view all the answers

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