Immune Response(Biochemistry ) Questions and Answers

Question 1.  In cellular immunity, T lymphocytes are responsible for the recognition and killing of foreign invaders. The cells are
  1.    cytotoxic T lymphocytes (CTL)
  2.    killer T cells
  3.    both (a) and (b)
  4.    none of the above
Explanation:-
Answer: Option C. -> both (a) and (b)
Question 2.  
Which of the following immune cells would have an especially low count in a patient with advanced AIDS?
  1.    Killer T lymphocytes
  2.    Helper T lymphocyte
  3.    B lymphocytes
  4.    None of these
Explanation:-
Answer: Option B. -> Helper T lymphocyte
Question 3.  If a person is vaccinated against a disease sometime in the past, which of the following is currently in your body?
  1.    The disease organism itself and antigens for the disease organism
  2.    A very high level of antibodies against the disease antigens
  3.    Memory B lymphocytes for the antigen of this disease organism
  4.    All of the above
Explanation:-
Answer: Option D. -> All of the above
Question 4.  What is a protein produced by host cells infected by viruses?
  1.    lnterferon
  2.    Histamine
  3.    Antiserum
  4.    Vaccine
Explanation:-
Answer: Option A. -> lnterferon
Question 5.  Plasma cells produce thousands of __________ that are released into the bloodstream
  1.    antigens
  2.    antibodies
  3.    helper T cells
  4.    virus fragments
Explanation:-
Answer: Option B. -> antibodies
Question 6.  Polysaccharides on the surface of infecting microorganisms can also activate complement directly in the absence of
  1.    antibody via the alternative pathway
  2.    antigen via the alternative pathway
  3.    antibody via metabolic pathway
  4.    none of the above
Explanation:-
Answer: Option A. -> antibody via the alternative pathway
Question 7.  Antibodies bound to an invading microorganism activate the complement system via
  1.    classical pathway
  2.    metabolic pathway
  3.    Embden Meyerhof pathway
  4.    Entner-Doudoroff pathway
Explanation:-
Answer: Option A. -> classical pathway
Question 8.  The immune response to a booster vaccine is called a(n)
  1.    cellular response
  2.    innate response
  3.    primary response
  4.    secondary response
Explanation:-
Answer: Option D. -> secondary response
Question 9.  Immunological memory is due to
  1.    short lived macrophage that can recognize specific pathogens
  2.    long lived B cells that secrete a specific antibody
  3.    long lived B cells that secrete a specific antigen
  4.    short lived helper T cells that signal macrophage to divide
Explanation:-
Answer: Option B. -> long lived B cells that secrete a specific antibody
Question 10. . What is the result of an abnormal response of the immune system to part of a person's own body?
  1.    Passive immunity
  2.    Cancer
  3.    An allergic response
  4.    An autoimmune disease
Explanation:-
Answer: Option D. -> An autoimmune disease
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