Free Specific Defense Mechanism MCQs with Answers
114 Specific Defense Mechanism 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 provide targeted immunity through B lymphocytes, T lymphocytes, antibodies and memory cells that recognize particular antigens. Questions cover humoral and cell mediated responses, clonal selection, primary and secondary immune responses, vaccination and passive immunity, while distinguishing adaptive defenses from the immediate, non specific innate response.
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- 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 region88. 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- A. Active Immunity
- B. Natural active immunity
- C. Passive immunity
- D. Vaccination
Explanation: The method of passive immunization is used to combat active infections such as tetanus, rabies, snake venom, etc. (PTB page:327)
Correct answer: Passive immunity- A. Antibiotics, antigen
- B. Antibodies, RBC
- C. Globulin, histamine
- D. Antibodies, antigen
Explanation: Antibodies, also known as immunoglobulins, are proteins produced by white blood cells in response to antigens, and they play a crucial…
Correct answer: Antibodies, antigen- A. Plasma
- B. Liver
- C. Inside various cells of body
- D. Outside the blood stream
Explanation: White blood cells are destroyed inside various cells of the body, where they encounter and destroy foreign substances through mechanisms…
Correct answer: Inside various cells of body- A. active immunity
- B. innate immunity
- C. passive immunity
- D. acquired immunity
Explanation: Passive immunity refers to the transfer of antibodies from one individual to another, providing immediate but temporary protection.
Correct answer: passive immunity- A. active immunity
- B. inflammatory response
- C. c
- D. d
Explanation: Inflammation is a response triggered by damage to living tissues. The inflammatory response is a defence mechanism that evolved in higher…
Correct answer: inflammatory response