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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. What is the function of memory cells?

Engulf pathogens

Recognize and respond quickly to previously encountered antigens

Produce histamine

Suppress immune responses

2. Where do T lymphocytes mature?

Spleen

Lymph nodes

Thymus gland

Bone marrow

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

It cannot form memory

It acts the same against all pathogens

It involves antigen recognition

It lacks precision

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

Passive immunity

Innate immunity

Cell-mediated immunity

Humoral immunity

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

Memory T cell

T-helper cell

Cytotoxic T cell

Regulatory T cell

6. What is the main function of plasma cells?

Store memory

Kill infected cells

Produce antibodies

Engulf bacteria

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

Cell death

Activation and differentiation into plasma cells

Destruction of the B cell

Suppression of immunity

8. Which immune cells are responsible for immunological memory?

Memory B and T cells

Neutrophils

Natural killer cells

Dendritic cells

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

Constant region

Light chain

Variable region

Heavy chain

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

Memory T cells

Regulatory T cells

Cytotoxic T cells

Helper T cells

11. Which structure displays antigens on infected cells?

Ribosomes

Complement proteins

MHC molecules

Histamines

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

Memory cells

Red blood cells

Antigen-presenting cells

Plasma cells

13. What is immune tolerance?

Inability to produce antibodies

Ability to ignore self-antigens

Attack on foreign cells

Resistance to all pathogens

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

Memory B cells

Plasma cells

Helper T cells

Macrophages

15. Which of the following provides passive immunity?

T cell activation

Antibodies from another organism

Memory cell activation

Vaccines

16. What is a vaccine?

A strong antibiotic

A hormone that boosts immunity

A preparation containing antigens

A type of antibody

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

Attack infected cells directly

Produce antibodies

Engulf pathogens

Produce histamines

18. What type of molecule is an antibody?

Lipid

Nucleic acid

Protein

Carbohydrate

19. What type of immunity results from a vaccination?

Artificial passive immunity

Artificial active immunity

Natural active immunity

Natural passive immunity

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

Passive immunity

Humoral immunity

Cell-mediated immunity

Innate immunity

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

IgM

IgG

IgE

IgA

22. 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

23. How do memory cells enhance the immune response?

By recognizing pathogens quickly

By producing mucus

By secreting enzymes

By destroying pathogens directly

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

Kidney

Thymus

Spleen

Liver

25. Which of the following produces interleukins?

B cells

T-helper cells

Macrophages only

Red blood cells

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26. What initiates the production of specific antibodies?

White blood cell count

Exposure to antigens

Complement proteins

Inflammation

27. What do antigens bind to on lymphocytes?

Receptors

Enzymes

Ribosomes

Hormones

28. Which immune cells mature in the thymus?

Macrophages

T cells

B cells

Neutrophils

29. Which cells are responsible for antibody production?

Plasma cells

Helper T cells

Cytotoxic T cells

Natural killer cells

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

Lymph nodes

Liver

Bone marrow

Spleen

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

Primary immune response

Passive immune response

Secondary immune response

Innate immune response

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

Helper T cell

Cytotoxic T cell

Memory B cell

Basophil

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

Passive immunity

Autoimmunity

Innate immunity

Active immunity

34. What is the role of cytotoxic T cells?

Kill virus-infected and cancerous cells

Produce antibodies

Activate B cells

Suppress immune response

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

IgE

IgM

IgA

IgG

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

Breaking down antigens directly

Neutralizing toxins and viruses

Activating red blood cells

Suppressing white blood cells

37. What allows antibodies to recognize specific antigens?

Their lipid membrane

Their carbohydrate chain

Their constant region

Their variable region

38. What is clonal selection in immunity?

Destruction of non-specific cells

Inflammation of infected tissues

Activation and proliferation of specific lymphocytes

Production of immune cells in the bone marrow

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

IgA

IgG

IgD

IgE

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

Recovery from chickenpox

Antibiotic use

Vaccination

Injection of antibodies

41. Which of the following best describes an antigen?

A molecule that triggers an immune response

A white blood cell

A type of antibody

A chemical produced by T cells

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

Lymphocytes

Platelets

Red blood cells

Neutrophils

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

Non-specific barriers

Speed

Memory and specificity

Inflammation

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

B cell

Natural killer cell

Cytotoxic T cell

T-helper cell

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

Macrophages

T cells

B cells

Natural killer cells

46. What do T-helper cells primarily do?

Activate B cells and cytotoxic T cells

Destroy infected cells

Suppress immune response

Produce antibodies

47. Which antibody is involved in allergic reactions?

IgG

IgA

IgM

IgE

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

Memory

Self/non-self recognition

Antigen specificity

Rapid initial response

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

It acts immediately

It has memory and specificity

It targets any foreign substance

It is always stronger than innate immunity

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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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