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.
Last updated
Read the Immunity notesFree MDCAT chapter notes with key terms139 questions · page 7 of 7
- 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- A. Children
- B. Adults
- C. Special populations
- D. All of the above
Explanation: The Bacillus Calmette-Guerin (BCG) vaccine is primarily given to children, especially in countries where tuberculosis (TB) is prevalent…
Correct answer: Children- A. Macrophages
- B. Lymphocytes
- C. Blood cells
- D. Skin
Explanation: The correct answer is skin. The skin acts as a physical barrier, preventing harmful pathogens from entering the body.
Correct answer: Skin- A. C-cells
- B. A & B cells
- C. B & C cells
- D. B & T cells
Explanation: The most abundant lymphocytes are B and T cells, which play critical roles in the immune system.
Correct answer: B & T cells- A. Attenuated vaccine
- B. Killed vaccine
- C. Subunit vaccine
- D. Toxoid vaccine
Explanation: Killed vaccine has least side effect. An inactivated vaccine (or killed vaccine) is a vaccine consisting of virus particles, bacteria, or…
Correct answer: Killed vaccine- A. Sebum
- B. Perspiration
- C. Interferon
- D. Epidermis
Explanation: The first line of defense includes physical and chemical barriers like the skin (including the epidermis), sebum, and perspiration, which…
Correct answer: Interferon- A. Platelets
- B. Cytotoxic T cells
- C. Antigens
- D. Red blood cell
Explanation: Cytotoxic T cells are a type of T lymphocyte that specifically targets and kills cells displaying foreign motifs on their surface.
Correct answer: Cytotoxic T cells- A. Inactivated vaccine
- B. Toxoid vaccine
- C. Subunit vaccine
- D. Live, attenuated vaccine
Explanation: Toxoid vaccines, such as those for diphtheria and tetanus, contain inactivated toxins produced by bacteria.
Correct answer: Toxoid vaccine- A. Eosinophils
- B. Basophils
- C. Neusrophils
- D. Lymphocytes
Explanation: The most common form of white blood cells (WBCs) in the body are neutrophils.
Correct answer: Neusrophils- A. Lung cancer
- B. Tuberculosis
- C. Pneumonia
- D. Emphysema
Explanation: Option B, "Tuberculosis," is the correct answer. The BCG (Bacillus Calmette-Guérin) vaccine is primarily used for the prevention of…
Correct answer: Tuberculosis- A. Natural killer cell
- B. Macrophages
- C. Antibodies
- D. Neutrophils
Explanation: Neutrophils are the first responders - they rush to the infection site, attack bacteria, and die in large numbers.During healing…
Correct answer: Macrophages- A. Platelets
- B. Eosinophils
- C. B-Lymphocytes
- D. T-Lymphocytes
Explanation: The thymus gland is a primary lymphoid organ responsible for the maturation and development of T-lymphocytes (T cells).
Correct answer: T-Lymphocytes137. Cytotoxic T-Cells _
- A. Directly kill invaders
- B. Aid B cells in their job
- C. Both a and b
- D. Suppress T cell activity
Explanation: Cytotoxic T-cells (also known as CD8+ T-cells) are a type of immune cell that directly kill infected cells, cancer cells, or cells that…
Correct answer: Directly kill invaders- A. Most abundant form of WBC's
- B. Have a short life span.
- C. Made by the thymus gland.
- D. Released by the bone marrow.
Explanation: Neutrophils are not made by the thymus gland. The thymus gland is responsible for the maturation and development of T-lymphocytes (a type…
Correct answer: Made by the thymus gland.- A. It is produced at the site of tissue injury.
- B. It has no role in the leakage of fluids into the tissues in inflammation.
- C. It destroys phagocytes.
- D. It produces interferon gamma.
Explanation: Bradykinin is a peptide hormone that plays a key role in the inflammatory response.
Correct answer: It is produced at the site of tissue injury.