Free Immunology MCQs with Answers
90 Immunology MCQs from Microbiology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
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- A. Delayed reaction
- B. Immediate reaction
- C. passive transfer by serum
- D. None of the above
Explanation: Anaphylaxis is an immediate type I hypersensitivity reaction that can be passively transferred by serum containing IgE.
Correct answer: Delayed reaction- A. IgG
- B. IgD
- C. IgM
- D. IgA
Explanation: IgA is the principal immunoglobulin in exocrine secretions such as saliva, tears, intestinal fluid and breast milk, where secretory IgA…
Correct answer: IgA- A. Lysosomes
- B. Proteolytic enzymes
- C. Lymphotoxins
- D. Vasoactive mediators
Explanation: Mast-cell granules contain vasoactive mediators such as histamine, which cause vasodilation, increased vascular permeability and…
Correct answer: Vasoactive mediators- A. Atopic allergy
- B. Serum sickness
- C. Transfusion reaction
- D. Contact dermatitis
Explanation: Serum sickness is a classic type III hypersensitivity reaction caused by deposition of circulating antigen-antibody immune complexes.
Correct answer: Serum sickness- A. C2a
- B. C3b
- C. C4a
- D. C5a
Explanation: C5a is the strongest chemotactic complement fragment and attracts neutrophils and other leukocytes to sites of inflammation.
Correct answer: C5a- A. IgA
- B. IgD
- C. IgE
- D. IgG
Explanation: Secretory IgA is the predominant immunoglobulin in saliva and other mucosal secretions, where it prevents microbial attachment and…
Correct answer: IgA87. Inactivated microorganisms are used in the manufacture of which of the following________________?
- A. Salk vaccine
- B. Tetanus toxoid
- C. Sabin's oral vaccine
- D. All of the above
Explanation: The Salk polio vaccine contains inactivated poliovirus. Sabin vaccine uses live attenuated virus, while tetanus toxoid contains…
Correct answer: Salk vaccine- A. Synovial fluid
- B. Myocardium
- C. Cardiac valves
- D. Vascular intima
Explanation: The group A streptococcal carbohydrate contains N-acetylglucosamine, which can cross-react with components of cardiac valves in rheumatic…
Correct answer: Cardiac valves- A. CD 4*
- B. CD 8*
- C. B - lymphocytes
- D. None of the above
Explanation: Protection against tuberculosis is mainly cell-mediated and is initiated by CD4 helper T cells, especially Th1 cells, which activate…
Correct answer: CD 4*- A. Hemoral immunity
- B. Cell mediated immunity
- C. Complement function
- D. Phagocyte dysfunction
Explanation: The tuberculin skin test is a delayed-type hypersensitivity reaction mediated by sensitised T lymphocytes, so it reflects cell-mediated…
Correct answer: Cell mediated immunity