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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?

Innate immune response

Primary immune response

Passive immune response

Secondary immune response

2. What do antigens bind to on lymphocytes?

Receptors

Ribosomes

Enzymes

Hormones

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

It cannot form memory

It acts the same against all pathogens

It lacks precision

It involves antigen recognition

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

Self/non-self recognition

Memory

Antigen specificity

Rapid initial response

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

Spleen

Bone marrow

Lymph nodes

Liver

6. Which immune cells are responsible for immunological memory?

Memory B and T cells

Dendritic cells

Natural killer cells

Neutrophils

7. What allows antibodies to recognize specific antigens?

Their constant region

Their carbohydrate chain

Their lipid membrane

Their variable region

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

Cell-mediated immunity

Passive immunity

Innate immunity

Humoral immunity

9. What type of molecule is an antibody?

Nucleic acid

Carbohydrate

Protein

Lipid

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

Antibiotic use

Vaccination

Injection of antibodies

Recovery from chickenpox

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

Macrophages

Memory B cells

Plasma cells

Helper T cells

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

It has memory and specificity

It acts immediately

It targets any foreign substance

It is always stronger than innate immunity

13. What is the main function of plasma cells?

Produce antibodies

Engulf bacteria

Store memory

Kill infected cells

14. What is the role of cytotoxic T cells?

Produce antibodies

Suppress immune response

Kill virus-infected and cancerous cells

Activate B cells

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

Cytotoxic T cells

Helper T cells

Memory T cells

Regulatory T cells

16. What is clonal selection in immunity?

Activation and proliferation of specific lymphocytes

Destruction of non-specific cells

Inflammation of infected tissues

Production of immune cells in the bone marrow

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

Kidney

Thymus

Liver

Spleen

18. Which of the following provides passive immunity?

Vaccines

Memory cell activation

T cell activation

Antibodies from another organism

19. Which immune cells mature in the thymus?

Neutrophils

B cells

T cells

Macrophages

20. What is the function of memory cells?

Recognize and respond quickly to previously encountered antigens

Suppress immune responses

Produce histamine

Engulf pathogens

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

Non-specific barriers

Memory and specificity

Inflammation

Speed

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

Cytotoxic T cell

Basophil

Helper T cell

Memory B cell

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

Regulatory T cell

Cytotoxic T cell

Memory T cell

T-helper cell

24. What initiates the production of specific antibodies?

Complement proteins

Inflammation

Exposure to antigens

White blood cell count

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

Constant region

Light chain

Heavy chain

Variable region

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26. 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

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

Memory cells

Red blood cells

Plasma cells

Antigen-presenting cells

28. What is immune tolerance?

Inability to produce antibodies

Ability to ignore self-antigens

Attack on foreign cells

Resistance to all pathogens

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

IgA

IgE

IgG

IgM

30. What do T-helper cells primarily do?

Produce antibodies

Suppress immune response

Activate B cells and cytotoxic T cells

Destroy infected cells

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

Natural killer cells

Macrophages

T cells

B cells

32. What is an epitope?

A type of lymphocyte

A white blood cell

A bacterial toxin

A site on the antigen recognized by the immune system

33. How do memory cells enhance the immune response?

By secreting enzymes

By destroying pathogens directly

By producing mucus

By recognizing pathogens quickly

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

Cell death

Suppression of immunity

Destruction of the B cell

Activation and differentiation into plasma cells

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

Passive immunity

Cell-mediated immunity

Innate immunity

Humoral immunity

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

IgM

IgE

IgG

IgA

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

Neutrophils

Red blood cells

Platelets

Lymphocytes

38. What type of immunity results from a vaccination?

Artificial active immunity

Natural active immunity

Artificial passive immunity

Natural passive immunity

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

IgE

IgA

IgG

IgD

40. Which of the following best describes an antigen?

A chemical produced by T cells

A type of antibody

A molecule that triggers an immune response

A white blood cell

41. Which antibody is involved in allergic reactions?

IgA

IgG

IgM

IgE

42. Which of the following produces interleukins?

Macrophages only

T-helper cells

B cells

Red blood cells

43. Where do T lymphocytes mature?

Spleen

Lymph nodes

Bone marrow

Thymus gland

44. What is a vaccine?

A type of antibody

A preparation containing antigens

A hormone that boosts immunity

A strong antibiotic

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

Engulf pathogens

Attack infected cells directly

Produce histamines

Produce antibodies

46. Which cells are responsible for antibody production?

Helper T cells

Plasma cells

Natural killer cells

Cytotoxic T cells

47. Which structure displays antigens on infected cells?

Ribosomes

MHC molecules

Histamines

Complement proteins

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

T-helper cell

Natural killer cell

B cell

Cytotoxic T cell

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

Autoimmunity

Innate immunity

Passive immunity

Active 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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