MDCAT Biology Quiz 12 – IMMUNITY Leave a Comment / By studentseoasis.org / July 24, 2025 1. Specific defense mechanisms are also called: A) Innate immunity B) Adaptive immunity C) Non-specific immunity D) Passive defense None 2. Which cells play a major role in specific defense mechanisms? A) Red blood cells B) Platelets C) Lymphocytes D) Neutrophils None 3. Antibodies are produced by: A) T-cells B) B-cells C) Monocytes D) Macrophages None 4. The specific immune response targets: A) All pathogens equally B) Specific antigens C) All bacteria D) General invaders None 5. Which type of immunity is acquired after vaccination? A) Natural passive immunity B) Natural active immunity C) Artificial active immunity D) Artificial passive immunity None 6. Which immunity is provided by mother's milk? A) Natural active immunity B) Natural passive immunity C) Lytic virusesC) Artificial active immunity D) Artificial passive immunity None 7. Cytotoxic T-cells destroy: A) Bacteria directly B) Virus-infected cells C) Antibodies D) Red blood cells None 8. Which of the following initiates specific immune response? A) Phagocytosis B) Antigen presentation C) Histamine release D) Inflammatory response None 9. Helper T-cells assist in: A) Killing infected cells directly B) Activating B-cells and cytotoxic T-cells C) Producing antibodies D) Secreting insulin None 10. Which molecule specifically binds to antigens? A) Cytokines B) Histamine C) Antibodies D) Lymph None 11. Primary immune response is: A) Faster and stronger B) Slower and weaker C) Immediate D) Always stronger None 12. Secondary immune response is: A) Slower B) Weaker C) Faster and stronger D) Same as primary None 13. Which immunoglobulin is most abundant in blood? A) IgA B) IgE C) IgG D) IgM None 14. IgE is primarily involved in: A) Bacterial infections B) Parasitic infections and allergies C) Antigen presentation D) Blood clotting None 15. Which cells remember past infections? A) Plasma cells B) Memory B-cells C) Cytotoxic T-cells D) Neutrophils None 16. Specific immunity involves recognition of: A) General pathogens B) Pathogen-associated molecular patterns C) Specific antigens D) Complement proteins None 17. Humoral immunity is mediated by: A) T-cells B) Antibodies C) Macrophages D) Natural killer cells None 18. Cell-mediated immunity involves: A) B-cells B) Antibodies C) T-cells D) Mast cells None 19. Which cells suppress immune responses to avoid overreaction? A) Helper T-cells B) Memory cells C) Regulatory T-cells D) Plasma cells None 20. Vaccination works by stimulating: A) Innate immunity B) Memory cell formation C) Passive immunity D) Antigen mutation None 21. Passive immunity provides: A) Long-term protection B) Immediate short-term protection C) Active antibody production D) Slow immune response None 22. Active immunity is developed by: A) Receiving ready-made antibodies B) Antigen exposure C) Injection of antibodies D) Anti-toxin administration None 23. Plasma cells secrete: A) Cytokines B) Histamine C) Antibodies D) Antigens None 24. Which T-cells directly kill infected cells? A) Helper T-cells B) Cytotoxic T-cells C) Memory T-cells D) Regulatory T-cells None 25. Which term describes any molecule that triggers an immune response? A) Antibody B) Pathogen C) Antigen D) Cytokine None 26. The function of antibodies includes: A) Direct killing of pathogens B) Phagocytosis C) Marking pathogens for destruction D) Production of lymph None 27. Plasma cells are derived from: A) T-cells B) Memory B-cells C) Activated B-cells D) Regulatory T-cells None 28. Which immunoglobulin is first produced during primary response? A) IgA B) IgM C) IgG D) IgE None 29. Specific immunity is important for: A) Immediate general defense B) Specific long-term protection C) Clotting of blood D) Non-specific inflammation None 30. Which type of T-cell is critical for activating both arms of specific immunity? A) Cytotoxic T-cell B) Memory T-cell C) Helper T-cell D) Natural killer cell None 31. Artificial passive immunity can be obtained by: A) Vaccination B) Injection of antivenom C) Infection recovery D) Breastfeeding None 32. Lymphocytes mature in: A) Bone marrow only B) Thymus only C) Bone marrow and thymus D) Spleen None 33. T-cells mature in the: A) Bone marrow B) Thymus gland C) Spleen D) Lymph nodes None 34. B-cells mature in the: A) Thymus B) Liver C) Bone marrow D) Spleen None 35. Antibodies are part of: A) Innate immunity B) Cell-mediated immunity C) Humoral immunity D) Non-specific immunity None 36. Helper T-cells are targeted by: A) Influenza virus B) Tuberculosis bacteria C) HIV D) Plasmodium parasite None 37. The importance of memory cells is to: A) Produce antibodies B) Destroy infected cells C) Provide faster response during second exposure D) Induce fever None 38. Cytokines are: A) Antibodies B) Signaling proteins C) Antigens D) Hormones None 39. Which immune component neutralizes toxins? A) Cytotoxic T-cells B) Antibodies C) Memory cells D) Neutrophils None 40. Immunological memory is a feature of: A) Innate immunity B) Specific immunity C) Phagocytosis D) Non-specific defenses None 41. Importance of specific defense mechanism includes all EXCEPT: A) Long-term immunity B) Pathogen-specific targeting C) Rapid first response D) Immunological memory None 42. Which antibody is found in secretions like tears and saliva? A) IgG B) IgM C) IgE D) IgA None 43. A person develops lifelong immunity after infection due to: A) Plasma cells B) Antibodies C) Memory cells D) Cytokines None 44. Antigen-presenting cells (APCs) include: A) T-cells B) B-cells only C) Macrophages, dendritic cells, B-cells D) Erythrocytes None 45. Which T-cells coordinate immune responses? A) Regulatory T-cells B) Cytotoxic T-cells C) Helper T-cells D) Memory T-cells None 46. Lack of which cells leads to immunodeficiency in HIV? A) Cytotoxic T-cells B) Helper T-cells C) Memory B-cells D) Plasma cells None 47. What type of immunity does a recovered patient exhibit? A) Natural active immunity B) Natural passive immunity C) Artificial active immunity D) Artificial passive immunity None 48. Specific immunity depends on: A) Platelets B) Antibodies and memory cells C) Red blood cells D) Neutrophils None 49. Function of regulatory T-cells is to: A) Destroy pathogens B) Activate macrophages C) Suppress overactive immune responses D) Produce antigens None 50. Specific defense mechanisms protect against: A) All invaders equally B) Only bacteria C) Recognized pathogens based on previous exposure D) Blood clotting disorders None 1 out of 50 Time's up
