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. 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-Lymphocytes112. 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.