Which of the following is an autoimmune disease?
Correct answer B. Type 1 diabetes mellitus
Topic / 45 questions
Immunity MCQs
Page 2 of Immunity multiple-choice questions with answers. Tap an option to check yourself.
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- Biological Molecules 74
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- Bioenergetics 55
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- Immunity 45
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What is an allergy?
Correct answer C. An excessive immune response to a normally harmless antigen
Which drug is given as emergency treatment for anaphylactic shock?
Correct answer D. Adrenaline (epinephrine)
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Why does passive immunity last only a few weeks or months?
Correct answer D. No memory cells are produced and the received antibodies are gradually broken down
Which antibody class binds to mast cells and basophils and triggers allergic reactions?
Correct answer A. IgE
The antigen-binding site of an antibody is formed by which regions?
Correct answer A. Variable regions of both heavy and light chains
What type of bond holds the heavy and light polypeptide chains of an antibody molecule together?
Correct answer D. Disulfide bonds
How many antigen-binding sites does a single IgG molecule have?
Correct answer D. 2
How many antigen-binding sites are present on one pentameric IgM molecule?
Correct answer D. 10
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What is the specific part of an antigen that is recognised and bound by an antibody called?
Correct answer C. Epitope
Which cells directly destroy body cells infected with viruses?
Correct answer D. Cytotoxic (killer) T cells
What is the main role of helper T cells in the immune response?
Correct answer C. Releasing cytokines that activate B cells and cytotoxic T cells
Which type of T cell switches off the immune response once an infection has been cleared?
Correct answer C. Suppressor (regulatory) T cells
Why is the secondary immune response faster and stronger than the primary response?
Correct answer C. Memory cells formed during the first exposure are already present
A person bitten by a snake is injected with ready-made antivenom. What type of immunity does this provide?
Correct answer A. Artificially acquired passive immunity
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A baby receives antibodies through breast milk. Which type of immunity is this?
Correct answer C. Naturally acquired passive immunity
A child develops immunity after recovering from chickenpox. What type of immunity is this?
Correct answer D. Naturally acquired active immunity
Which lymphocytes are mainly responsible for humoral (antibody-mediated) immunity?
Correct answer C. B lymphocytes
Which antibody class is found mainly in secretions such as tears, saliva and colostrum?
Correct answer D. IgA
Which antibody exists as a pentamer and is the first class produced during a primary immune response?
Correct answer D. IgM