Free Immunity MCQs with Answers
139 Immunity MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Specific defense mechanisms protect the body through antigen recognition by B and T lymphocytes. The topic covers clonal selection, antibody production, plasma and memory cells, cell-mediated responses, helper and cytotoxic T cells, and the difference between primary and secondary immune responses.
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- A. Radiotherapy
- B. Chemotherapy
- C. Vaccination
- D. Antibiotics
Explanation: Acquired immunity comes from vaccines and exposure to diseases. These enable the body to develop antigens that can help it fight the same…
Correct answer: Vaccination- A. Neutralizing an antigen
- B. Precipitating an antigen
- C. Secreting cytokines
- D. Enhancing phagocytosis
Explanation: Antibody cells do not secrete many cytokines upon activation.
Correct answer: Secreting cytokines- A. Neutralizing an antigen
- B. Precipitating an antigen
- C. Secretion of cytokines
- D. Enhancing phagocytosis
Explanation: Antibodies primarily work by neutralizing antigens, precipitating antigens, and enhancing phagocytosis.
Correct answer: Secretion of cytokines- A. Monocytes
- B. Lymphocytes
- C. Neutrophils
- D. Thrombocytes
Explanation: Lymphocytes are white blood cells that are also one of th·e body's main types of immune cells.
Correct answer: Lymphocytes- A. Natural passive immunity
- B. Natural active immunity
- C. Acquired/Artificial active immunity
- D. Acquired/Artificial passive immunity
Explanation: Vaccination involves introducing antibodies (acquired) or antibodies-producing agents (artificial) into the body to provide active immunity.
Correct answer: Acquired/Artificial active immunity- A. Lipase
- B. Protease
- C. Amylase
- D. Polymerase
Explanation: Option A: Lipase is an enzyme that primarily breaks down lipids (fats). It does not play a significant role in digesting antibodies.
Correct answer: Protease- A. 1876
- B. 1796
- C. 1696
- D. 1850
Explanation: Correct option is B. Dr Edward Jenner created the world's first successful vaccine.
Correct answer: 1796- A. Will produce anti-Rh antibodies if given Rh* blood
- B. Rh* antigens are present on RBCs
- C. Cannot produce anti-Rh antibodies in any case
- D. Rh* antibodies are present in blood
Explanation: Explanation:If Rh- person receives Rh antigen through the wrong Rh+ blood transfusion, he will begin to produce anti-Rh antibodies against…
Correct answer: Will produce anti-Rh antibodies if given Rh* blood- A. AIDS and Cancer
- B. Malaria and AIDS
- C. Typhoid and Cancer
- D. Measles and Mumps
Explanation: Measles and mumps, both can be prevented by a joint two-dose vaccine, i.e. the MMR vaccine.
Correct answer: Measles and Mumps- A. Platelets
- B. B-Lymphocytes
- C. Eosinophils
- D. T-Lymphocytes
Explanation: The thymus gland is involved in the maturation of T cells, a type of white blood cell that plays a vital role in the immune system.
Correct answer: T-Lymphocytes- A. Antigens
- B. Immunogens
- C. Serum
- D. Immunoglobulins
Explanation: Immunoglobulins (antibodies) are directly introduced to provide immediate immunity.
Correct answer: Immunoglobulins- A. Heavy chain
- B. Light chain
- C. Variable region
- D. Constant region
Explanation: The variable region binds specifically to antigens, giving antibodies their specificity.
Correct answer: Variable region113. Two identical light chains and two identical heavy chains in the antibody molecule are linked by:
- A. Disulphide bridges
- B. Peptide bond
- C. Glycerol bond
- D. Ionic bond
Explanation: Disulphide bonds can be used to hold different sub-units of protein complexes together, as is found in antibodies between the light chains…
Correct answer: Disulphide bridges- A. Basophils
- B. Platelets
- C. Monocyte
- D. Eosinophils
Explanation: Histamine is synthesized primarily by mast cells, basophils, histaminergic neurons in the basal ganglia of the brain, and…
Correct answer: Basophils- A. Eosinophils
- B. Monocytes
- C. Neutrophils
- D. Lymphocytes
Explanation: Neutrophils are the most abundant WBCs. These are phagocytic. They kill and digest bacteria and fungi.
Correct answer: Neutrophils- A. cell-mediated response
- B. Humoral Response
- C. Active Response
- D. Compound Response
Explanation: Immunity provided by the AB secreted in the circulatory system by B cells is termed humoral immunity.
Correct answer: Humoral Response- A. Both light chains only
- B. Both heavy chains only
- C. One heavy and one light chain
- D. Both heavy and light chains
Explanation: The amino acid sequence in the tips of the "Y" varies greatly among different antibodies.
Correct answer: Both heavy and light chains- A. Basophil
- B. Neutrophil
- C. Eosinophil
- D. Monocyte
Explanation: Basophils release heparin to prevent blood clots and histamine which causes inflammation.
Correct answer: Basophil- A. Eight
- B. Four
- C. Six
- D. Two
Explanation: An Antibody molecule is made up of 4 polypeptide chains i.e. two heavy chains and two light chains. (PTB page:326)
Correct answer: Four- A. Memory cells
- B. B-lymphocytes
- C. T-lymphocytes
- D. Plasma cells
Explanation: Plasma B cells are cells produced or specialized in the bone marrow. They tend to release significant amounts of antibodies in response to…
Correct answer: Plasma cells