Antigens And Immune Response(Biochemistry ) Questions and Answers

Question 1. 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
Answer: (b).Memory cells
Question 2. 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
Answer: (d).repairing damage to the body wall
Question 3. 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
Answer: (b).B cells
Question 4. Which of these is a type of specific defense against pathogens?
  1.    Lymphocytes
  2.    Macrophages
  3.    Phagocytes
  4.    Leukocytes
Explanation:-
Answer: Option A. -> Lymphocytes
Answer: (a).Lymphocytes
Question 5. 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
Answer: (b).thymus gland
Question 6. For specific antigen recognition by T cells,
  1.    antigen is bound by a T cell membrane antibody
  2.    denaturation of antigen does not reduce epitope recognition
  3.    MHC molecules are not required
  4.    antigen exposure during T cell maturation is required
Explanation:-
Answer: Option B. -> denaturation of antigen does not reduce epitope recognition
Answer: (b).denaturation of antigen does not reduce epitope recognition
Question 7. The antibiotic penicillin is a small molecule that does not induce antibody formation. However, penicillin binds to serum proteins and forms a complex that in some people induces antibody formation resulting in an allergic reaction. Penicillin is therefore
  1.    an antigen
  2.    a hapten
  3.    an immunogen
  4.    both an antigen and a hapten
Explanation:-
Answer: Option D. -> both an antigen and a hapten
Answer: (d).both an antigen and a hapten
Question 8. Which of the following is incorrect with regard to antigen epitopes?
  1.    An epitope may be shared by two different antigens
  2.    A protein molecule usually contains multiple epitopes
  3.    B cells bind only processed antigen epitopes
  4.    Epitopes may be linear or assembled
Explanation:-
Answer: Option C. -> B cells bind only processed antigen epitopes
Answer: (c).B cells bind only processed antigen epitopes
Question 9. Antigen, when injected in the body activates its specific lymphocytes in the
  1.    blood circulation
  2.    draining lymph nodes
  3.    MALT (mucosa associated
  4.    spleen lymphoid tissue
Explanation:-
Answer: Option B. -> draining lymph nodes
Answer: (b).draining lymph nodes
Question 10. A molecule that can be covalently linked to a non-immunogenic antigen to make it an immunogen is called a (n)
  1.    adjuvant
  2.    carrier
  3.    hapten
  4.    mitogen
Explanation:-
Answer: Option B. -> carrier
Answer: (b).carrier
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