Biomed 100 Practice Quiz
Chapter 14, Fall 2006
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  1. Which organs normally contain the greatest numbers of lymphocytes?
    1. heart and lungs
    2. liver and lungs
    3. spleen and kidneys
    4. lymph nodes and liver
    5. lymph nodes and spleen
      6.

  2. Which one of the following is not a function of a lymph node?
    1. filter foreign particles from lymph (body fluid)
    2. house T cells that may respond to antigens
    3. destroy old erythrocytes (red blood cells)
      4.

  3. True or false? Macrophages and lymphocytes are often collected together and function together to provide immunity.
    1. True.
      2.
    2. False.

  4. What is the location of the thymus?
    1. in thorax (chest) posterior to sternum
      2.
    2. upper left part of abdominal cavity
    3. attached to undersurface of liver
    4. "tucked into" curvature of duodenum
    5. inguinal region (anterior to hip joint, outside body wall)

  5. Of the factors listed below, which has the greatest capability to kill bacteria and other organisms in the stomach?
    1. low pH
      2.
    2. intrinsic factor
    3. digestive enzymes
    4. mucous produced by gastric glands
    5. rugae ("folds" in wall of stomach)

  6. What is the role of "receptors" in the immune response?
    1. they allow certain lymphocytes to recognize antigens
      2.
    2. they destroy DNA of "target cells"
    3. they form holes in membranes of "target cells"
    4. once released by helper T cells, they stimulate production of B cell clones
    5. they are put "on display" by macrophages to activate lymphocytes

  7. For both B cells and T cells, the first step in activation is attachment of a(n)...
    1. antigen
      2.
    2. antibody
    3. perforin
    4. receptor
    5. complement

  8. Activation of the complement system that creates holes in bacteria often requires that _?_ be attached to the bacteria.
    1. DNA or RNA
    2. viruses
    3. perforins
    4. antibodies
      5.
    5. helper T cells

  9. Which one of the following is best able to directly neutralize a foreign protein?
    1. macrophage
    2. cytotoxic T cell
    3. memory T cell
    4. antibody molecule
      5.

  10. True or false. The thymus normally remains approximately one-half the size of the heart throughout a person's lifetime.
    1. True.
    2. False.
      3.

  11. "Specific immunity" includes...
    1. resistance to particular pathogens
    2. resistance to toxins produced by pathogens
    3. both of the above
      4.
    4. none of the above

  12. Large quantities of antibodies may be produced by...
    1. macrophages
    2. antigen-presenting cells
    3. a subset of cells in a B cell clone
      4.
    4. a subset of cells in a T cell clone

  13. The cellular immune response...
    1. is mainly a function of T cells
    2. is effective at destroying cells that contain viruses
    3. is effective at destroying some types of tumor/cancer cells
    4. all of the above
      5.
    5. none of the above

  14. A cytotoxic (killer) T cell may attack a target cell by...
    1. activating enzymes that destroy DNA of target cell
    2. introducing perforin which creates holes in membrane of target cell
    3. secreting antibodies that agglutinate target cells
    4. both A. and B.
      5.
    5. both B. and C.

  15. Which one of the following is true?
    1. "Immune surveillance" consists of the constant inventory of "self" proteins that occurs throughout life.
    2. Each person has many types of lymphocytes but each type responds only to a specific antigen.
      3.
    3. Both of the above are true.
    4. None of the above are true.

  16. "Secondary immune response" refers to...
    1. immunity provided by antibodies in mother's milk or by injection
    2. the type of response that occurs when an individual is exposed to two antigens simultaneously
    3. an efficient response carried out by "memory" cells that were produced during a previous encounter with an antigen
      4.
    4. an inefficient response carried out by plasma cells
    5. an inefficient response carried out by helper T cells