Biology Immunity Online Mcqs Test

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You can prepare for Biology Immunity Online Mcqs Test by attempting the free online quizzes at Gotest.com.pk. We provide instant results, performance reports, and detailed explanations for every question.

Question 1

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

Answer

Light chain

Answer

Heavy chain

Answer

Variable region

Answer

Constant region

Question 2

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

Question 3

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

Answer

Cytotoxic T cell

Answer

Regulatory T cell

Answer

T-helper cell

Answer

Memory T cell

Question 4

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

Answer

Neutralizing toxins and viruses

Answer

Breaking down antigens directly

Answer

Suppressing white blood cells

Answer

Activating red blood cells

Question 5

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

Answer

It acts the same against all pathogens

Answer

It lacks precision

Answer

It involves antigen recognition

Answer

It cannot form memory

Question 6

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

Answer

Innate immune response

Answer

Secondary immune response

Answer

Primary immune response

Answer

Passive immune response

Question 7

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

Answer

Injection of antibodies

Answer

Recovery from chickenpox

Answer

Antibiotic use

Answer

Vaccination

Question 8

8. What is clonal selection in immunity?

Answer

Inflammation of infected tissues

Answer

Destruction of non-specific cells

Answer

Activation and proliferation of specific lymphocytes

Answer

Production of immune cells in the bone marrow

Question 9

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

Answer

Regulatory T cells

Answer

Cytotoxic T cells

Answer

Memory T cells

Answer

Helper T cells

Question 10

10. What is an epitope?

Answer

A white blood cell

Answer

A type of lymphocyte

Answer

A site on the antigen recognized by the immune system

Answer

A bacterial toxin

Question 11

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

Answer

Cytotoxic T cell

Answer

T-helper cell

Answer

Natural killer cell

Question 12

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

Question 13

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

Answer

Self/non-self recognition

Answer

Antigen specificity

Answer

Rapid initial response

Question 14

14. What allows antibodies to recognize specific antigens?

Answer

Their variable region

Answer

Their carbohydrate chain

Answer

Their constant region

Answer

Their lipid membrane

Question 15

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

Answer

Non-specific barriers

Answer

Inflammation

Answer

Memory and specificity

Question 16

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

Question 17

17. What type of molecule is an antibody?

Answer

Carbohydrate

Answer

Nucleic acid

Question 18

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

Answer

Passive immunity

Answer

Cell-mediated immunity

Answer

Innate immunity

Answer

Humoral immunity

Question 19

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

Answer

Lymphocytes

Answer

Neutrophils

Answer

Red blood cells

Question 20

20. Which of the following produces interleukins?

Answer

Macrophages only

Answer

T-helper cells

Answer

Red blood cells

Question 21

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

Question 22

22. Which of the following best describes an antigen?

Answer

A type of antibody

Answer

A molecule that triggers an immune response

Answer

A white blood cell

Answer

A chemical produced by T cells

Question 23

23. How do memory cells enhance the immune response?

Answer

By destroying pathogens directly

Answer

By recognizing pathogens quickly

Answer

By producing mucus

Answer

By secreting enzymes

Question 24

24. What type of immunity results from a vaccination?

Answer

Artificial passive immunity

Answer

Artificial active immunity

Answer

Natural active immunity

Answer

Natural passive immunity

Question 25

25. Where do T lymphocytes mature?

Answer

Lymph nodes

Answer

Bone marrow

Answer

Thymus gland

Question 26

26. What is immune tolerance?

Answer

Ability to ignore self-antigens

Answer

Attack on foreign cells

Answer

Inability to produce antibodies

Answer

Resistance to all pathogens

Question 27

27. Which immune cells are responsible for immunological memory?

Answer

Dendritic cells

Answer

Neutrophils

Answer

Natural killer cells

Answer

Memory B and T cells

Question 28

28. What do antigens bind to on lymphocytes?

Question 29

29. Which structure displays antigens on infected cells?

Answer

Histamines

Answer

MHC molecules

Answer

Complement proteins

Question 30

30. What do T-helper cells primarily do?

Answer

Destroy infected cells

Answer

Produce antibodies

Answer

Suppress immune response

Answer

Activate B cells and cytotoxic T cells

Question 31

31. Which antibody is involved in allergic reactions?

Question 32

32. What is a vaccine?

Answer

A type of antibody

Answer

A strong antibiotic

Answer

A preparation containing antigens

Answer

A hormone that boosts immunity

Question 33

33. What is the main function of plasma cells?

Answer

Engulf bacteria

Answer

Produce antibodies

Answer

Kill infected cells

Answer

Store memory

Question 34

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

Answer

Activation and differentiation into plasma cells

Answer

Suppression of immunity

Answer

Destruction of the B cell

Answer

Cell death

Question 35

35. Which cells are responsible for antibody production?

Answer

Cytotoxic T cells

Answer

Plasma cells

Answer

Natural killer cells

Answer

Helper T cells

Question 36

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

Answer

Cell-mediated immunity

Answer

Humoral immunity

Answer

Passive immunity

Answer

Innate immunity

Question 37

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

Answer

Active immunity

Answer

Innate immunity

Answer

Autoimmunity

Answer

Passive immunity

Question 38

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

Answer

Macrophages

Answer

Natural killer cells

Question 39

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

Answer

Produce antibodies

Answer

Engulf pathogens

Answer

Produce histamines

Answer

Attack infected cells directly

Question 40

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

Answer

It has memory and specificity

Answer

It acts immediately

Answer

It is always stronger than innate immunity

Answer

It targets any foreign substance

Question 41

41. Which of the following provides passive immunity?

Answer

T cell activation

Answer

Antibodies from another organism

Answer

Memory cell activation

Question 42

42. What initiates the production of specific antibodies?

Answer

Inflammation

Answer

White blood cell count

Answer

Complement proteins

Answer

Exposure to antigens

Question 43

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

Answer

Helper T cells

Answer

Macrophages

Answer

Memory B cells

Answer

Plasma cells

Question 44

44. Which immune cells mature in the thymus?

Answer

Macrophages

Answer

Neutrophils

Question 45

45. What is the role of cytotoxic T cells?

Answer

Activate B cells

Answer

Kill virus-infected and cancerous cells

Answer

Suppress immune response

Answer

Produce antibodies

Question 46

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

Answer

Lymph nodes

Answer

Bone marrow

Question 47

47. What is the function of memory cells?

Answer

Suppress immune responses

Answer

Recognize and respond quickly to previously encountered antigens

Answer

Produce histamine

Answer

Engulf pathogens

Question 48

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

Answer

Red blood cells

Answer

Memory cells

Answer

Antigen-presenting cells

Answer

Plasma cells

Question 49

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

Answer

Cytotoxic T cell

Answer

Helper T cell

Answer

Memory B cell

Question 50

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Total Questions:	49
Time Allowed:	25 Minutes
Total Marks:	49
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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Biology Immunity Online Mcqs Test

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Important Biology Immunity Question and Answer

Biology Immunity Practice Test Online With Explanation

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Key Preparation Tips:

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