Sloma.Immune System I And Ii_practice Questions

6 Questions | Total Attempts: 419

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Immune System Quizzes & Trivia

Questions and Answers
  • 1. 
    Which of the following is not a direct consequence of antibody binding to antigen?
    • A. 

      Activation of B cells

    • B. 

      Neturalization of the antigen

    • C. 

      Activation of complement

    • D. 

      Phagocytosis of the antigen

    • E. 

      Activation of T cells

  • 2. 
    Immunodeficienies can be caused by defects in expression of many different molecules that contribute to both adaptive and innate immune responses. Failure to express which molecule would have no effect on the immune system’s ability to eliminate an extracellular bacterium?
    • A. 

      MHC class I

    • B. 

      MHC class II

    • C. 

      Surface‐bound antibody molecules

    • D. 

      Toll‐like receptors

    • E. 

      Complement components

  • 3. 
    Your patient, a 7 month‐old boy, is suffering from repeated ear infections. In the lab, you determine that he has a defect in B cell function. What is the most likely defect?
    • A. 

      Inability to synthesize toxic nitric oxides

    • B. 

      Failure to produce complement components

    • C. 

      Failure to express toll‐like receptors

    • D. 

      Failure to express MHC class I molecules

    • E. 

      Failure to express surface‐bound antibody molecules

  • 4. 
    How do macrophages play an important role in the elimination of pathogens?
    • A. 

      Produce complement proteins that can eliminate the pathogen

    • B. 

      Phagocytosis of pathogens followed by presentation of antigens to B cells

    • C. 

      Phagocytosis of pathogens followed by oxygen‐dependent and oxygen‐independent killing of the pathogen

    • D. 

      Produce antibody molecules that can mark the pathogen for destruction

    • E. 

      Phagocytosis of pathogens followed by formation of the membrane‐attack complex that causes lysis of pathogens

  • 5. 
    Antigen presenting cells are essential in contributing to the activation of T cells. How do they accomplish this?
    • A. 

      They use MHC class I and class II molecules to present peptide antigens to T cells

    • B. 

      They use MHC class I and class II molecules to present carbohydrate antigens to T cells

    • C. 

      They secrete complement proteins that activate T cells

    • D. 

      They present antigen:antibody complexes to T cells

    • E. 

      They trigger activation of T cells through Toll‐like receptors

  • 6. 
    What type of pathogen would be processed and loaded into MHC class II molecules?
    • A. 

      Antigens from a parasite that infects endothelial cells

    • B. 

      Antigens from a virus infecting endothelial cells

    • C. 

      Antigens from a bacterium infecting endothelial cells

    • D. 

      Antigens from extracellular bacteria

    • E. 

      Antigens from bacteria that infects endothelial cells

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