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Biology Immunity Online Mcqs Test

Mustansar KhanLast Updated: October 14, 2025

Important Biology Immunity Question and Answer

Total Questions:	49
Time Allowed:	25 Minutes
Total Marks:	49
How to Attempt Test:	Please choose the right Option in MCQ-type question.
Test Helpful For:	Biology Test MDCAT Test FPSC/PPSC/SPSC/KPPSC/BPSC/AJKPSC/NTS Biology Interview Question Answer Universities Entrance Test

Biology Immunity Practice Test Online With Explanation

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1. What is the key feature of the adaptive immune system?

Memory and specificity

Non-specific barriers

Inflammation

Speed

2. What is a vaccine?

A type of antibody

A hormone that boosts immunity

A strong antibiotic

A preparation containing antigens

3. Which is an example of naturally acquired active immunity?

Injection of antibodies

Recovery from chickenpox

Vaccination

Antibiotic use

4. Which cells are primarily responsible for the specific immune response?

Lymphocytes

Neutrophils

Red blood cells

Platelets

5. Which immune cells are responsible for immunological memory?

Dendritic cells

Memory B and T cells

Neutrophils

Natural killer cells

6. Which of the following types of T cells directly kill infected host cells?

Helper T cells

Memory T cells

Regulatory T cells

Cytotoxic T cells

7. Which antibody is involved in allergic reactions?

IgG

IgM

IgA

IgE

8. Which of the following is a characteristic of the specific immune response?

It targets any foreign substance

It acts immediately

It has memory and specificity

It is always stronger than innate immunity

9. Which cell type destroys cells displaying foreign antigens on their surface?

Helper T cell

Cytotoxic T cell

Memory B cell

Basophil

10. Which type of immunity is provided by antibodies produced by B cells?

Cell-mediated immunity

Humoral immunity

Innate immunity

Passive immunity

11. What type of immunity results from a vaccination?

Natural active immunity

Artificial active immunity

Artificial passive immunity

Natural passive immunity

12. Which immune response is faster and stronger upon second exposure to the same antigen?

Primary immune response

Secondary immune response

Innate immune response

Passive immune response

13. Which antibody is mainly found in secretions like saliva and tears?

IgM

IgA

IgE

IgG

14. What do T-helper cells primarily do?

Activate B cells and cytotoxic T cells

Produce antibodies

Suppress immune response

Destroy infected cells

15. Which of the following is NOT a characteristic of specific defense?

Rapid initial response

Memory

Self/non-self recognition

Antigen specificity

16. Which antibody class is the most abundant in the bloodstream?

IgA

IgG

IgD

IgE

17. Which of the following is the first antibody produced during an immune response?

IgG

IgA

IgM

IgE

18. Which immune cells mature in the thymus?

B cells

Macrophages

T cells

Neutrophils

19. Which cells are responsible for antibody production?

Helper T cells

Natural killer cells

Plasma cells

Cytotoxic T cells

20. What do antigens bind to on lymphocytes?

Ribosomes

Hormones

Enzymes

Receptors

21. What is the function of memory cells?

Produce histamine

Engulf pathogens

Suppress immune responses

Recognize and respond quickly to previously encountered antigens

22. What is the main function of plasma cells?

Store memory

Produce antibodies

Kill infected cells

Engulf bacteria

23. Which part of the body produces B and T cells?

Lymph nodes

Spleen

Liver

Bone marrow

24. What is immune tolerance?

Attack on foreign cells

Ability to ignore self-antigens

Inability to produce antibodies

Resistance to all pathogens

25. Which organ is primarily involved in filtering blood and initiating immune responses?

Liver

Spleen

Kidney

Thymus

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26. Which part of the immune system is trained to avoid attacking the body’s own cells?

Macrophages

B cells

T cells

Natural killer cells

27. Which of the following cells do not belong to the specific defense system?

Memory B cells

Plasma cells

Macrophages

Helper T cells

28. Which type of T cell suppresses the immune response?

Regulatory T cell

Cytotoxic T cell

Memory T cell

T-helper cell

29. How do memory cells enhance the immune response?

By secreting enzymes

By producing mucus

By recognizing pathogens quickly

By destroying pathogens directly

30. Which cells present antigens to activate specific immune responses?

Red blood cells

Plasma cells

Antigen-presenting cells

Memory cells

31. Which type of immunity involves T cells attacking infected cells?

Humoral immunity

Innate immunity

Cell-mediated immunity

Passive immunity

32. Which structure on an antibody allows it to bind to a specific antigen?

Heavy chain

Constant region

Light chain

Variable region

33. Which structure displays antigens on infected cells?

Complement proteins

Histamines

MHC molecules

Ribosomes

34. Which immune cell activates both humoral and cell-mediated immunity?

Natural killer cell

T-helper cell

B cell

Cytotoxic T cell

35. Which of the following is true about the specific immune response?

It cannot form memory

It involves antigen recognition

It acts the same against all pathogens

It lacks precision

36. Where do T lymphocytes mature?

Lymph nodes

Bone marrow

Spleen

Thymus gland

37. What is the term for a long-lasting immune response following recovery from an infection?

Innate immunity

Active immunity

Autoimmunity

Passive immunity

38. Which of the following best describes an antigen?

A chemical produced by T cells

A white blood cell

A molecule that triggers an immune response

A type of antibody

39. What type of molecule is an antibody?

Nucleic acid

Lipid

Carbohydrate

Protein

40. Which of the following produces interleukins?

Macrophages only

B cells

Red blood cells

T-helper cells

41. What initiates the production of specific antibodies?

White blood cell count

Complement proteins

Exposure to antigens

Inflammation

42. What is the main function of B lymphocytes in the immune system?

Engulf pathogens

Produce antibodies

Produce histamines

Attack infected cells directly

43. What allows antibodies to recognize specific antigens?

Their carbohydrate chain

Their constant region

Their variable region

Their lipid membrane

44. Which of the following provides passive immunity?

T cell activation

Antibodies from another organism

Vaccines

Memory cell activation

45. What is the role of cytotoxic T cells?

Activate B cells

Suppress immune response

Kill virus-infected and cancerous cells

Produce antibodies

46. Which of the following is a major function of antibodies?

Suppressing white blood cells

Breaking down antigens directly

Activating red blood cells

Neutralizing toxins and viruses

47. What is an epitope?

A type of lymphocyte

A bacterial toxin

A white blood cell

A site on the antigen recognized by the immune system

48. What happens after antigen binding to a B cell receptor?

Activation and differentiation into plasma cells

Destruction of the B cell

Cell death

Suppression of immunity

49. What is clonal selection in immunity?

Destruction of non-specific cells

Activation and proliferation of specific lymphocytes

Production of immune cells in the bone marrow

Inflammation of infected tissues

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Mustansar KhanLast Updated: October 14, 2025

Biology Immunity Online Mcqs Test

Important Biology Immunity Question and Answer

Biology Immunity Practice Test Online With Explanation

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