XI Biology Immunity Online Test Mdcat-2024

Instructions for Immunity Online Test Mdcat-2024:

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Test Details:

Subject: Biology
Class: 1st year or 11
Chapter Name: Immunity
Test: MDCAT 2024
Book: Sindh Textbook
Total No. Of MCQS: 50 MCQS
Time Allowed: 50 Minutes
Price : Free

1589

Created on July 27, 2024 By

medicoengineer.com

XI Biology Immunity Online Test Mdcat-2024

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NameEmailPhone Number

1 / 50

1. Immunity is defined as:

a) The exposure to pathogenic living organisms

b) Resistance of the body against pathogenic living things

c) Resistance to antibodies

d) Resistance to our own cells

2 / 50

2. The immune system can be divided into:

a) Internal and external

b) Innate and adaptive

c) Internal and adaptive

d) Innate and external

3 / 50

3. Tick the correct statement about the innate immune system:

- I. It is non-specific

- II. Consists of two lines of defense

- III. Skin acts as a physical barrier in the innate immune system

- IV. B and T cells are part of the innate immune system

a) Only I

b) Only I and III

c) Only I, II, and III

d) All are correct

4 / 50

4. Natural Killer cells are _____ in nature, and come under the _______ line of defense of the _____________:

a) Specific; 2nd line; innate immune system

b) Non-specific; 1st line; innate immune system

c) Non-specific; 2nd line; adaptive immune system

d) Non-specific; 2nd line; innate immune system

5 / 50

5. Spermine is a ___________ of _________ immunity:

a) Biochemical barrier; innate

b) Physiological barrier; adaptive

c) Biochemical barrier; adaptive

d) Both C and D

6 / 50

6. Which of the following is not a feature of adaptive immunity?

a) Cell-mediated immunity

b) Antibody-mediated immunity

c) B and T cells

d) Non-specific

7 / 50

7. The primary function of skin is to act as a ____________:

a) Barrier

b) Insulator

c) Sweat producer

d) All of these

8 / 50

8. Skin is made up of three main layers, which are __________:

a) Epidermis, dermis, endodermis

b) Epidermis, dermis, hypodermis

c) Ectodermis, dermis, hypodermis

d) Ectodermis, dermis, endodermis

9 / 50

9. Which skin layer lacks blood supply?

a) Epidermis

b) Hypodermis

c) Ectodermis

d) Endodermis

10 / 50

10. Langerhans cells are ___________ cells found in ___________:

a) Immune cells; liver

b) Immune cells; skin

c) Neuroglial cells; brain

d) Immune cells; blood

11 / 50

11. Which skin layer contains sweat and sebaceous glands?

a) Epidermis

b) Hypodermis

c) Dermis

d) Endodermis

12 / 50

12. Which skin layer serves as an insulating layer?

a) Epidermis

b) Hypodermis

c) Dermis

d) Endodermis

13 / 50

13. The gut mucosa or mucous membrane along with its mucous serves as ____________:

a) Non-specific physical barrier

b) Biochemical barrier

c) Adaptive barrier

d) Both A and B

14 / 50

14. The gut lymphoid tissues are found in ____________:

a) Tonsils

b) Peyer's patches

c) Appendix

d) All of these

15 / 50

15. Air passageway plays a role in __________ of defense:

a) 1st line

b) 2nd line

c) 3rd line

d) none

16 / 50

16. The mucous membrane of the respiratory system is composed of ________ cells layer:

a) Ciliated squamous epithelial

b) Non-ciliated squamous epithelial

c) Ciliated columnar epithelial

d) Non-ciliated columnar epithelial

17 / 50

17. Which of the following responses are of the 2nd line of defense?

a) Phagocytosis

b) Cytotoxicity

c) Inflammation and fever

d) All of these

18 / 50

18. Which of the following cells perform phagocytosis when harmful foreign particles enter the human body?

a) Macrophages (Monocytes)

b) Dendritic cells

c) Neutrophils

d) All of these

19 / 50

19. Tick the incorrect statement about neutrophils:

a) Most abundant WBCs

b) Specially adapted to phagocytize viruses

c) 50%-70% of all leukocytes

d) Provides non-specific defense

20 / 50

20. The mature neutrophils have a ______________ and ___________ nucleus:

a) Multi-lobed; spherical

b) Multi-lobed; non-spherical

c) Bi-lobed; non-spherical

d) Uni-lobed; non-spherical

21 / 50

21. Tick the correct statement about monocytes:

a) Round-shaped nucleus

b) Granulated cytoplasm

c) They constitute about 20-80% of leukocytes

d) They originate from myeloid stem cells

22 / 50

22. The average lifespan of monocytes in the blood is __________:

a) 5 to 10 days

b) 2 to 5 days

c) 2 to 10 days

d) 4 to 8 days

23 / 50

23. What are macrophages derived from?

a) Lymphocytes

b) Neutrophils

c) Monocytes

d) Erythrocytes

24 / 50

24. Which type of leukocytes do macrophages belong to?

a) Agranulocytes

b) Eosinophils

c) Basophils

d) Granulocytes

25 / 50

25. After circulating in the blood, where do monocytes migrate to become macrophages?

a) Lymphoid tissues

b) Non-lymphoid tissues

c) Blood

d) Both A and B

26 / 50

26. Macrophages in the central nervous system and liver are respectively called:

a) Kupffer cells and microglia

b) Alveolar macrophages and microglia

c) Microglia and Kupffer cells

d) Dendritic cells and Kupffer cells

27 / 50

27. Which of the following is not a function of macrophages?

a) Phagocytosis of foreign cells

b) Involvement in innate immunity

c) Secretion of antibodies

d) Digestion of worn-out cells

28 / 50

28. What is another term for macrophages due to their role in presenting antigens to T-cells?

a) Natural Killer Cells

b) Plasma Cells

c) Antigen Presenting Cells

d) Helper Cells

29 / 50

29. Unlike macrophages, what happens to dendritic cells after they activate T-cells?

a) They proliferate

b) They migrate to the bone marrow

c) They die

d) They transform into T-cells

30 / 50

30. Which type of lymphocytes are involved in detecting and eliminating virally infected cells as well as cancer cells?

a) NK cells

b) Natural Killer cells

c) Monocytes

d) Both A and B

31 / 50

31. What molecule on the cell surface do NK cells check for identification?

a) Immunoglobulin

b) Complement proteins

c) Major Histocompatibility Complex-I (MHC-I)

d) Cytokines

32 / 50

32. Which cytotoxic granules are released by NK cells to induce cell lysis?

a) Histamine and serotonin

b) Perforin and granzyme

c) Lysozyme and defensins

d) Interleukin and interferon

33 / 50

33. What is the primary difference in activation between NK cells and Cytotoxic T cells?

a) NK cells require antigen presentation for activation

b) Cytotoxic T cells require antigen presentation for activation

c) Both require antigen presentation for activation

d) Neither require antigen presentation for activation

34 / 50

34. Which major histocompatibility complex do Cytotoxic T Cells bind with?

a) MHC-II

b) MHC-III

c) MHC-I

d) MHC-IV

35 / 50

35. Which cytokine is released by Tc cells to enhance immune responses?

a) Interleukin-2 (IL-2)

b) Interleukin-4 (IL-4)

c) Interferon-gamma (IFN-γ)

d) Interferon-alpha (IFN-α)

36 / 50

36. What type of cells do Cytotoxic T Cells share a similar lytic function with?

a) Macrophages

b) NK Cells

c) B Cells

d) Dendritic Cells

37 / 50

37. Which of the following can trigger inflammatory responses?

a) Infection

b) Tissue damage

c) Autoimmune disorders

d) All of these

38 / 50

38. Which of the following is correct about the inflammatory response?

a) Acute type: long term

b) Chronic type: short term

c) Specific in nature

d) Autoimmune disorder can cause inflammatory responses

39 / 50

39. What does an autoimmune disorder mean?

a) A condition where the immune system fails to fight infections.

b) A condition where the immune system attacks its own body's cells and tissues.

c) A condition caused by an overactive thyroid gland.

d) A condition where the body is unable to produce enough red blood cells.

40 / 50

40. Fever is ___________:

a) Disease

b) Symptom

c) Disorder

d) All of these

41 / 50

41. Substances which induce fever are known as __________ and can be ________:

a) Pyrogens; Endogenous

b) Pyrogens: Endogenous and Exogenous

c) Virogens; Exogenous

d) Fever Chemicals; Endogenous

42 / 50

42. What is the third line of defense in the immune system referred to as?

a) Innate immunity

b) Acquired or adaptive immunity

c) Inflammatory response

d) Physical barriers

43 / 50

43. What is the structure of MHC-I composed of?

a) Three alpha sub-units and a beta microglobulin

b) Two alpha sub-units and a beta microglobulin

c) Two alpha sub-units and two beta microglobulins

d) One alpha sub-unit and one beta microglobulin

44 / 50

44. Resistance provided by adaptive immunity is ________ and ____________:

a) Faster; long-lasting

b) Slower; long-lasting

c) Slower; short-lasting

d) Faster; short-lasting

45 / 50

45. Natural passive immunity can be achieved by:

a) Via breast milk

b) Through placenta

c) Through inoculation of immune serum from other organisms

d) Natural passive immunity is impossible

e) Both A and B

46 / 50

46. What is the primary difference between active and passive immunity?

a) Active immunity involves the transfer of ready-made antibodies from one individual to another, while passive immunity is developed through the body’s own immune response to an antigen

b) Active immunity is acquired through the body's own immune response to an antigen, while passive immunity involves the transfer of ready-made antibodies from one individual to another.

c) Active immunity provides immediate protection, while passive immunity takes time to develop.

d) Active immunity can only be obtained through vaccination, while passive immunity can only be obtained through natural infection

47 / 50

47. Which types of lymphocytes are described as morphologically indistinguishable?

a) T cells and B cells

b) T cells and NK cells

c) B cells and plasma cells

d) Monocytes and neutrophils

48 / 50

48. T cytotoxic cells have ______________ marker:

a) CD4 and CD8

b) CD4

c) CD8

d) No any

49 / 50

49. Antibody-secreting B cells are known as:

a) Plasma cells

b) Antibody-producing cells

c) B memory cells

d) All of these

50 / 50

50. How does our body reject transplanted organs?

a) T-helper cells activate B cells to produce antibodies which destroy grafted tissue

b) B cells activate T-helper cells to produce antibodies which destroy grafted tissue

c) T-helper cells produce antibodies which destroy grafted tissue

d) Both A and C

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