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 the key feature of the adaptive immune system?

Non-specific barriers

Speed

Memory and specificity

Inflammation

2. Where do T lymphocytes mature?

Bone marrow

Spleen

Thymus gland

Lymph nodes

3. How do memory cells enhance the immune response?

By destroying pathogens directly

By producing mucus

By secreting enzymes

By recognizing pathogens quickly

4. Which of the following best describes an antigen?

A type of antibody

A molecule that triggers an immune response

A chemical produced by T cells

A white blood cell

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

It acts immediately

It is always stronger than innate immunity

It targets any foreign substance

It has memory and specificity

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

Passive immunity

Humoral immunity

Cell-mediated immunity

Innate immunity

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

Secondary immune response

Innate immune response

Passive immune response

Primary immune response

8. Which immune cells mature in the thymus?

T cells

Neutrophils

Macrophages

B cells

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

Neutralizing toxins and viruses

Activating red blood cells

Breaking down antigens directly

Suppressing white blood cells

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

Cytotoxic T cell

Natural killer cell

B cell

T-helper cell

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

Destruction of the B cell

Cell death

Activation and differentiation into plasma cells

Suppression of immunity

12. What do T-helper cells primarily do?

Activate B cells and cytotoxic T cells

Produce antibodies

Destroy infected cells

Suppress immune response

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

Innate immunity

Passive immunity

Humoral immunity

Cell-mediated immunity

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

Memory B cell

Basophil

Cytotoxic T cell

Helper T cell

15. Which immune cells are responsible for immunological memory?

Neutrophils

Memory B and T cells

Dendritic cells

Natural killer cells

16. What is the function of memory cells?

Recognize and respond quickly to previously encountered antigens

Suppress immune responses

Produce histamine

Engulf pathogens

17. What type of immunity results from a vaccination?

Natural passive immunity

Artificial active immunity

Natural active immunity

Artificial passive immunity

18. Which cells are responsible for antibody production?

Plasma cells

Cytotoxic T cells

Helper T cells

Natural killer cells

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

Autoimmunity

Passive immunity

Active immunity

Innate immunity

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

Produce histamines

Engulf pathogens

Produce antibodies

Attack infected cells directly

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

It lacks precision

It acts the same against all pathogens

It cannot form memory

It involves antigen recognition

22. What is a vaccine?

A strong antibiotic

A hormone that boosts immunity

A preparation containing antigens

A type of antibody

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

IgA

IgG

IgE

IgM

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

Lymph nodes

Liver

Bone marrow

Spleen

25. Which structure displays antigens on infected cells?

MHC molecules

Histamines

Complement proteins

Ribosomes

Page 2 of 2

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 type of T cell suppresses the immune response?

Memory T cell

T-helper cell

Cytotoxic T cell

Regulatory T cell

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

Liver

Spleen

Thymus

Kidney

29. Which antibody is involved in allergic reactions?

IgM

IgE

IgG

IgA

30. Which of the following produces interleukins?

T-helper cells

Red blood cells

Macrophages only

B cells

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

IgM

IgG

IgE

IgA

32. What type of molecule is an antibody?

Nucleic acid

Carbohydrate

Lipid

Protein

33. What is the main function of plasma cells?

Store memory

Engulf bacteria

Produce antibodies

Kill infected cells

34. Which of the following provides passive immunity?

Antibodies from another organism

Vaccines

T cell activation

Memory cell activation

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

Neutrophils

Lymphocytes

Platelets

Red blood cells

36. What is the role of cytotoxic T cells?

Kill virus-infected and cancerous cells

Produce antibodies

Activate B cells

Suppress immune response

37. What initiates the production of specific antibodies?

White blood cell count

Complement proteins

Inflammation

Exposure to antigens

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

Antibiotic use

Vaccination

Recovery from chickenpox

Injection of antibodies

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

IgD

IgE

IgA

IgG

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

Plasma cells

Macrophages

Helper T cells

Memory B cells

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

Antigen-presenting cells

Plasma cells

Memory cells

Red blood cells

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

Variable region

Light chain

Heavy chain

Constant region

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

Cytotoxic T cells

Memory T cells

Helper T cells

Regulatory T cells

44. What allows antibodies to recognize specific antigens?

Their lipid membrane

Their constant region

Their variable region

Their carbohydrate chain

45. 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

46. What do antigens bind to on lymphocytes?

Hormones

Receptors

Enzymes

Ribosomes

47. What is clonal selection in immunity?

Activation and proliferation of specific lymphocytes

Inflammation of infected tissues

Production of immune cells in the bone marrow

Destruction of non-specific cells

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

Antigen specificity

Memory

Rapid initial response

Self/non-self recognition

49. What is immune tolerance?

Resistance to all pathogens

Inability to produce antibodies

Attack on foreign cells

Ability to ignore self-antigens

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