Question 1

Which of the following best describes the primary function of the lymphatic system in immunity?

Accepted Answer

It transports lymphocytes and filters lymph to remove pathogens.

Question 2

Which of the following is an example of a non-specific (innate) defense mechanism?

Accepted Answer

Skin acting as a physical barrier

Question 3

A patient receives an injection of antibodies after being exposed to rabies. This is an example of:

Accepted Answer

Passive immunity

Question 4

Which of the following best explains why organ transplants may be rejected by the recipient's immune system?

Accepted Answer

The recipient's immune system recognizes foreign glycoproteins as antigens.

Question 5

Which of the following is NOT a function of antibodies?

Accepted Answer

Directly lysing infected cells by releasing perforin

Question 6

Which cell type is primarily responsible for the cell-mediated immune response?

Accepted Answer

Cytotoxic T cells

Question 7

A person is exposed to the influenza virus for the first time and develops symptoms. Which immune response is primarily responsible for fighting off the infection?

Accepted Answer

Primary immune response

Question 8

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

Accepted Answer

It creates pores in infected cell membranes, leading to cell death.

Question 9

Which of the following is a correct sequence of events in the inflammatory response?

Accepted Answer

Histamines are released → capillaries dilate → phagocytes migrate to the site of infection

Question 10

Which of the following best explains why a person who has recovered from chickenpox is unlikely to get it again?

Accepted Answer

Memory cells produced during the primary response enable a faster secondary immune response.

Question 11

Which of the following is a characteristic of autoimmune diseases?

Accepted Answer

The immune system attacks the body’s own cells.

Question 12

Which of the following is an example of active immunity?

Accepted Answer

Receiving a vaccine for measles

Question 13

Which of the following best describes the role of helper T cells in the immune response?

Accepted Answer

They secrete cytokines to activate B cells and cytotoxic T cells.

Question 14

Which of the following is a reason why HIV infection leads to immunodeficiency?

Accepted Answer

HIV preferentially infects and destroys helper T cells.

Question 15

Which of the following is NOT a way that antibodies help eliminate antigens?

Accepted Answer

Directly phagocytosing pathogens

Question 16

A person with a genetic disorder cannot produce enough phagocytic white blood cells. Which of the following is a likely consequence?

Accepted Answer

Impaired non-specific (innate) immune response

Question 17

Which of the following best describes the difference between humoral and cell-mediated immunity?

Accepted Answer

Humoral immunity involves B cells and antibodies; cell-mediated immunity involves T cells targeting infected cells.

Question 18

Which of the following best explains the cause of allergies in terms of the immune system?

Accepted Answer

The immune system overreacts to harmless antigens, releasing histamines.

Question 19

Which of the following is a correct description of clonal selection?

Accepted Answer

It is the process by which specific lymphocytes proliferate after recognizing an antigen.

Question 20

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

Accepted Answer

They engulf and digest pathogens and present antigens to T cells.

Immunology: The Lymphatic System and Immune Defenses

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