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MDCAT Biology Immunity Online Test

Mustansar KhanLast Updated: June 14, 2025

MDCAT Biology Immunity Test

MDCAT Biology Immunity Chaper 12 Online Test

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:	MDCAT Entry Test Biology Online Test Interview Questions about Biology All Universities Entrance Test Recruitments Tests

MDCAT Biology Immunity MCQS Online Test

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

Passive immune response

Primary immune response

Secondary immune response

Innate immune response

2. What type of immunity results from a vaccination?

Artificial passive immunity

Natural passive immunity

Natural active immunity

Artificial active immunity

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

Antibiotic use

Injection of antibodies

Recovery from chickenpox

Vaccination

4. Which structure displays antigens on infected cells?

MHC molecules

Ribosomes

Complement proteins

Histamines

5. What is a vaccine?

A preparation containing antigens

A strong antibiotic

A hormone that boosts immunity

A type of antibody

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

Memory T cells

Cytotoxic T cells

Regulatory T cells

Helper T cells

7. What is an epitope?

A white blood cell

A bacterial toxin

A site on the antigen recognized by the immune system

A type of lymphocyte

8. Which of the following produces interleukins?

B cells

T-helper cells

Macrophages only

Red blood cells

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

Non-specific barriers

Inflammation

Memory and specificity

Speed

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

Red blood cells

Plasma cells

Memory cells

Antigen-presenting cells

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

Produce histamines

Attack infected cells directly

Engulf pathogens

Produce antibodies

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

IgE

IgM

IgA

IgG

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

Cell-mediated immunity

Humoral immunity

Passive immunity

Innate immunity

14. What is the main function of plasma cells?

Engulf bacteria

Kill infected cells

Store memory

Produce antibodies

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

IgM

IgA

IgE

IgG

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

Memory B cells

Macrophages

Helper T cells

Plasma cells

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

Macrophages

B cells

T cells

Natural killer cells

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

Passive immunity

Active immunity

Autoimmunity

Innate immunity

19. What initiates the production of specific antibodies?

Complement proteins

White blood cell count

Exposure to antigens

Inflammation

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

Helper T cell

Cytotoxic T cell

Memory B cell

Basophil

21. What is the function of memory cells?

Suppress immune responses

Produce histamine

Engulf pathogens

Recognize and respond quickly to previously encountered antigens

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

Light chain

Heavy chain

Variable region

Constant region

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

It has memory and specificity

It acts immediately

It is always stronger than innate immunity

It targets any foreign substance

24. Which immune cells mature in the thymus?

Neutrophils

T cells

Macrophages

B cells

25. Which of the following provides passive immunity?

Memory cell activation

T cell activation

Vaccines

Antibodies from another organism

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26. Which of the following best describes an antigen?

A white blood cell

A type of antibody

A molecule that triggers an immune response

A chemical produced by T cells

27. What do antigens bind to on lymphocytes?

Ribosomes

Enzymes

Hormones

Receptors

28. What is immune tolerance?

Resistance to all pathogens

Ability to ignore self-antigens

Attack on foreign cells

Inability to produce antibodies

29. Where do T lymphocytes mature?

Bone marrow

Spleen

Lymph nodes

Thymus gland

30. 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

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

Neutrophils

Red blood cells

Lymphocytes

Platelets

32. 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

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

Bone marrow

Lymph nodes

Liver

Spleen

34. How do memory cells enhance the immune response?

By recognizing pathogens quickly

By destroying pathogens directly

By secreting enzymes

By producing mucus

35. What do T-helper cells primarily do?

Activate B cells and cytotoxic T cells

Destroy infected cells

Suppress immune response

Produce antibodies

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

It acts the same against all pathogens

It involves antigen recognition

It lacks precision

It cannot form memory

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

Cytotoxic T cell

B cell

Natural killer cell

T-helper cell

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

Destruction of the B cell

Suppression of immunity

Activation and differentiation into plasma cells

Cell death

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

Humoral immunity

Passive immunity

Cell-mediated immunity

Innate immunity

40. Which cells are responsible for antibody production?

Helper T cells

Natural killer cells

Plasma cells

Cytotoxic T cells

41. What allows antibodies to recognize specific antigens?

Their constant region

Their carbohydrate chain

Their variable region

Their lipid membrane

42. What type of molecule is an antibody?

Lipid

Protein

Carbohydrate

Nucleic acid

43. Which immune cells are responsible for immunological memory?

Natural killer cells

Neutrophils

Dendritic cells

Memory B and T cells

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

Rapid initial response

Memory

Antigen specificity

Self/non-self recognition

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

Memory T cell

T-helper cell

Regulatory T cell

Cytotoxic T cell

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

Liver

Thymus

Kidney

Spleen

47. What is the role of cytotoxic T cells?

Produce antibodies

Kill virus-infected and cancerous cells

Activate B cells

Suppress immune response

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

IgA

IgG

IgD

IgE

49. Which antibody is involved in allergic reactions?

IgG

IgM

IgE

IgA

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Mustansar KhanLast Updated: June 14, 2025

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MDCAT Biology Immunity Online Test

MDCAT Biology Immunity Test

MDCAT Biology Immunity Chaper 12 Online Test

MDCAT Biology Immunity MCQS Online Test

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Mustansar Khan

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MDCAT Biology Immunity Test

MDCAT Biology Immunity Chaper 12 Online Test

MDCAT Biology Immunity MCQS Online Test

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Mustansar Khan

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