Question 1

Which of the following best describes the process by which T-cells are activated in the immune response?

Accepted Answer

T-cells are activated by binding to antigens presented on MHC molecules by antigen-presenting cells, followed by co-stimulation signals.

Question 2

Helper T-cells (Th cells) play a crucial role in the immune response. Which of the following is a primary function of helper T-cells?

Accepted Answer

Activating B-cells and other T-cells by releasing cytokines such as interleukin-2.

Question 3

Which cytokine is primarily responsible for stimulating the proliferation of T-cells after activation?

Accepted Answer

Interleukin-2 ($$IL-2)$$

Question 4

A patient is unable to mount an effective immune response due to a lack of co-stimulation signals during T-cell activation. Which of the following best explains the consequence?

Accepted Answer

T-cells will not become activated, leading to immune tolerance.

Question 5

Which of the following immune cells is responsible for releasing perforins to destroy infected or abnormal cells?

Accepted Answer

Cytotoxic T-cells

Question 6

Natural killer (NK) cells differ from cytotoxic T-cells in which of the following ways?

Accepted Answer

NK cells can recognize and destroy cells without prior sensitization to specific antigens.

Question 7

Which of the following best describes the role of interleukin-17 ($$IL-17) in $$the immune system?

Accepted Answer

It promotes inflammation and is involved in autoimmune diseases.

Question 8

A new medication is being used to treat autoimmune diseases by targeting $$IL-17. $$What is the intended effect of this medication?

Accepted Answer

Reduce inflammation by inhibiting $$IL-17$$ activity.

Question 9

Which of the following is a correct sequence of events for the activation of B-cells to produce antibodies?

Accepted Answer

B-cell binds antigen, receives help from helper T-cell, undergoes clonal expansion, differentiates into plasma cells.

Question 10

Which immune cell type is most likely to be involved in fighting parasitic worm infections and is associated with allergic responses?

Accepted Answer

Eosinophils

Question 11

A patient with a deficiency in helper T-cells would most likely experience which of the following?

Accepted Answer

Impaired activation of both B-cells and cytotoxic T-cells.

Question 12

Which of the following statements about antigen-presenting cells (APCs) is correct?

Accepted Answer

APCs present antigens on MHC molecules to activate T-cells.

Question 13

Which equation best represents the clonal expansion of T-cells after activation, assuming each activated T-cell divides $$n$$ times?

Accepted Answer

$$N = 2^n$$

Question 14

A patient is exposed to a virus for the first time. Which immune cells are primarily responsible for the initial recognition and presentation of viral antigens to T-cells?

Accepted Answer

Antigen-presenting cells such as dendritic cells and macrophages

Question 15

Which of the following is NOT a function of cytokines in the immune response?

Accepted Answer

Directly phagocytosing pathogens

Question 16

Which of the following best explains why co-stimulation is necessary for T-cell activation?

Accepted Answer

It prevents autoimmunity by ensuring T-cells are only activated in the presence of both antigen and additional signals.

Question 17

Which immune cell type is most likely to be involved in the destruction of cancer cells by releasing cytotoxic granules?

Accepted Answer

Natural killer (NK) cells

Question 18

Which of the following best describes the role of perforins in the immune response?

Accepted Answer

Perforins create pores in the target cell membrane, leading to cell lysis.

Question 19

Which of the following is a correct statement about the difference between cytotoxic T-cells and helper T-cells?

Accepted Answer

Cytotoxic T-cells directly kill infected cells, while helper T-cells coordinate the immune response by releasing cytokines.

Question 20

Which of the following best describes the role of memory T-cells in the immune system?

Accepted Answer

They provide a faster and stronger response upon re-exposure to the same antigen.

Cellular Immunity: T-Cells, B-Cells, and Immune Responses

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