Immune System(Biochemistry ) Questions and Answers

Question 1.  Lack of reaction to our own human leukocyte antigens (HLAs) is known as?
  1.    autoimmunity
  2.    complement system
  3.    clonal selection
  4.    tolerance
Explanation:-
Answer: Option D. -> tolerance
Question 2.  Which of the following components of the vertebrate immune response occurs first upon invasion by a virus or bacterium?
  1.    Activation of killer T lymphocytes
  2.    Activation of B lymphocytes
  3.    The inflammatory response
  4.    Mobilization of complement proteins
Explanation:-
Answer: Option C. -> The inflammatory response
Question 3.  Which of the following white blood cells act as scavengers when they engulf and digest pathogens?
  1.    Macrophages
  2.    T cells
  3.    B cells
  4.    Lymphocytes
Explanation:-
Answer: Option A. -> Macrophages
Question 4.  A cell which defends against body cells in which viruses are reproducing is
  1.    Exotoxin
  2.    Cytotoxic T cell
  3.    Endotoxin
  4.    Suppressor T cell
Explanation:-
Answer: Option B. -> Cytotoxic T cell
Question 5.  Which of the following is most likely to produce anaphylaxis in a susceptible individual?
  1.    Pollen
  2.    Mold
  3.    Dust
  4.    Bee sting
Explanation:-
Answer: Option D. -> Bee sting
Question 6.  What type of B cell remains dormant in the body, but can respond rapidly if the same antigen appears again?
  1.    T cells
  2.    Memory cells
  3.    Plasma cells
  4.    Macrophages
Explanation:-
Answer: Option B. -> Memory cells
Question 7.  The maturation of T cells and the production of particular T cell receptors occurs in the
  1.    thyroid gland
  2.    thymus gland
  3.    testes
  4.    all of these
Explanation:-
Answer: Option B. -> thymus gland
Question 8.  Which of the following provide specific defense against viruses and bacteria?
  1.    T cells
  2.    B cells
  3.    Complement
  4.    inflammation
Explanation:-
Answer: Option B. -> B cells
Question 9.  Which of these is a type of specific defense against pathogens?
  1.    Lymphocytes
  2.    Macrophages
  3.    Phagocytes
  4.    Leukocytes
Explanation:-
Answer: Option A. -> Lymphocytes
Question 10. . In animals, blood clots serve the function of
  1.    consuming invading organisms
  2.    helping them match the background coloration of the habitat
  3.    stimulating production of killer T lymphocytes
  4.    repairing damage to the body wall
Explanation:-
Answer: Option D. -> repairing damage to the body wall
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