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

Please wait...

Page 1 of 2

Uncategorized

1. What is immune tolerance?

Ability to ignore self-antigens

Attack on foreign cells

Resistance to all pathogens

Inability to produce antibodies

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

IgG

IgM

IgA

IgE

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

Natural killer cells

Macrophages

B cells

T cells

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

Speed

Inflammation

Memory and specificity

Non-specific barriers

5. What do T-helper cells primarily do?

Activate B cells and cytotoxic T cells

Suppress immune response

Destroy infected cells

Produce antibodies

6. What type of molecule is an antibody?

Protein

Carbohydrate

Lipid

Nucleic acid

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

It is always stronger than innate immunity

It acts immediately

It targets any foreign substance

It has memory and specificity

8. Where do T lymphocytes mature?

Lymph nodes

Bone marrow

Thymus gland

Spleen

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

Autoimmunity

Passive immunity

Innate immunity

Active immunity

10. What is the role of cytotoxic T cells?

Activate B cells

Suppress immune response

Produce antibodies

Kill virus-infected and cancerous cells

11. What is an epitope?

A bacterial toxin

A site on the antigen recognized by the immune system

A white blood cell

A type of lymphocyte

12. What initiates the production of specific antibodies?

Inflammation

Exposure to antigens

White blood cell count

Complement proteins

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

Passive immunity

Cell-mediated immunity

Innate immunity

Humoral immunity

14. What allows antibodies to recognize specific antigens?

Their carbohydrate chain

Their lipid membrane

Their constant region

Their variable region

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

Spleen

Liver

Kidney

Thymus

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

Memory B cells

Plasma cells

Macrophages

Helper T cells

17. What is the main function of plasma cells?

Produce antibodies

Engulf bacteria

Store memory

Kill infected cells

18. Which cells are responsible for antibody production?

Helper T cells

Cytotoxic T cells

Natural killer cells

Plasma cells

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

Suppression of immunity

Cell death

Destruction of the B cell

Activation and differentiation into plasma cells

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

It involves antigen recognition

It cannot form memory

It acts the same against all pathogens

It lacks precision

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

Memory T cell

T-helper cell

Regulatory T cell

Cytotoxic T cell

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

Lymph nodes

Spleen

Liver

Bone marrow

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

Cytotoxic T cells

Helper T cells

Regulatory T cells

Memory T cells

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

T-helper cell

B cell

Natural killer cell

Cytotoxic T cell

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

IgM

IgG

IgE

IgA

Page 2 of 2

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

Cell-mediated immunity

Humoral immunity

Innate immunity

Passive immunity

27. Which immune cells are responsible for immunological memory?

Natural killer cells

Dendritic cells

Memory B and T cells

Neutrophils

28. Which of the following provides passive immunity?

T cell activation

Vaccines

Memory cell activation

Antibodies from another organism

29. How do memory cells enhance the immune response?

By recognizing pathogens quickly

By secreting enzymes

By destroying pathogens directly

By producing mucus

30. Which immune cells mature in the thymus?

T cells

Macrophages

Neutrophils

B cells

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

Innate immune response

Primary immune response

Passive immune response

Secondary immune response

32. Which structure displays antigens on infected cells?

Complement proteins

MHC molecules

Ribosomes

Histamines

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

Neutrophils

Red blood cells

Platelets

Lymphocytes

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

Produce histamines

Engulf pathogens

Produce antibodies

Attack infected cells directly

35. Which of the following best describes an antigen?

A chemical produced by T cells

A white blood cell

A type of antibody

A molecule that triggers an immune response

36. What do antigens bind to on lymphocytes?

Hormones

Enzymes

Receptors

Ribosomes

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

Plasma cells

Red blood cells

Memory cells

Antigen-presenting cells

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

Basophil

Helper T cell

Memory B cell

Cytotoxic T cell

39. Which of the following produces interleukins?

B cells

Macrophages only

T-helper cells

Red blood cells

40. What is clonal selection in immunity?

Inflammation of infected tissues

Production of immune cells in the bone marrow

Activation and proliferation of specific lymphocytes

Destruction of non-specific cells

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

Recovery from chickenpox

Antibiotic use

Vaccination

Injection of antibodies

42. What is a vaccine?

A hormone that boosts immunity

A preparation containing antigens

A type of antibody

A strong antibiotic

43. Which antibody is involved in allergic reactions?

IgM

IgE

IgA

IgG

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

Light chain

Heavy chain

Constant region

Variable region

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

IgD

IgA

IgE

IgG

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

Neutralizing toxins and viruses

Breaking down antigens directly

Activating red blood cells

Suppressing white blood cells

47. What is the function of memory cells?

Engulf pathogens

Produce histamine

Recognize and respond quickly to previously encountered antigens

Suppress immune responses

48. What type of immunity results from a vaccination?

Natural active immunity

Artificial passive immunity

Artificial active immunity

Natural passive immunity

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

Rapid initial response

Self/non-self recognition

Memory

Antigen specificity

More Related Resources

Punjab 11th Class Biology Immunity ... KPK 11th Class Biology Chapter 13 I... 11th Class Biology Chapter 5 Variet... 11th Class Biology Chapter 14 Trans... PPSC Syllabus for Biology Lecturer ... 10th Class Biology Chapter 9 Pharma... KPK Board 10th Class Biology Ch 9 P... KPK Board 12th Class Biology Ch 26 ... KPK Board 12th Class Biology Ch 20 ... KPK Board 12th Class Biology Ch 14 ...

Can't find what you're looking for? Search below:

Latest Updates

PPSC Syllabus for Biology Lecturer 2026 Sample Test Pattern
New MDCAT Syllabus 2026 Chapter Wise Download PDF online

Mustansar KhanLast Updated: October 14, 2025

Important Biology Immunity Question and Answer

Biology Immunity Practice Test Online With Explanation

Uncategorized

More Related Resources

Latest Updates

Mustansar Khan

Leave a Reply Cancel reply