Question 1

Which of the following best describes the role of endogenous pyrogens in the immune response?

Accepted Answer

They are chemicals produced by the body that induce fever to slow bacterial growth.

Question 2

A patient receives an injection of antibodies after a snake bite. This is an example of which type of immunity?

Accepted Answer

Artificially acquired passive immunity

Question 3

Which of the following is NOT a function of antibodies?

Accepted Answer

Directly lysing infected cells by releasing perforin

Question 4

Which cell type is responsible for presenting antigens to Helper T cells using Class II MHC proteins?

Accepted Answer

Macrophages (as antigen-presenting cells)

Question 5

A person develops a rash 2 days after exposure to poison ivy. This is an example of which type of hypersensitivity?

Accepted Answer

Type IV (delayed) hypersensitivity

Question 6

Which of the following best explains why a person usually only gets chicken pox once?

Accepted Answer

Memory B cells are produced during the primary response, leading to a rapid and effective secondary response.

Question 7

Which of the following is a correct description of the function of Natural Killer (NK) cells?

Accepted Answer

They lyse and kill cancer and virus-infected cells before the specific immune response is activated.

Question 8

Which immunoglobulin class is primarily responsible for the secondary immune response and is the most abundant in plasma?

Accepted Answer

IgG

Question 9

What is the main purpose of inflammation in the immune response?

Accepted Answer

To prevent the spread of damaging agents, dispose of cell debris and pathogens, and prepare for tissue repair.

Question 10

Which of the following best describes the role of Class I MHC proteins?

Accepted Answer

They are found on all nucleated cells and present endogenous antigens to cytotoxic T cells.

Question 11

A patient with AIDS is highly susceptible to infections because the virus targets which immune cell?

Accepted Answer

Helper T cells (CD4+)

Question 12

Which process describes the movement of white blood cells out of the bloodstream to the site of tissue injury?

Accepted Answer

Diapedesis

Question 13

Which of the following is a function of complement proteins in the immune response?

Accepted Answer

They form the Membrane Attack Complex (MAC) to lyse bacterial cells.

Question 14

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

Accepted Answer

Humoral immunity involves antibodies produced by B cells, while cell-mediated immunity involves cytotoxic T cells targeting infected cells.

Question 15

Which of the following is a correct sequence of events in the primary humoral immune response?

Accepted Answer

Antigen binds to B cell → B cell clones itself → Plasma cells produce antibodies → Memory cells are formed

Question 16

Which of the following best explains why fever can be beneficial during an infection?

Accepted Answer

Fever slows bacterial growth, allowing the immune system to catch up.

Question 17

Which of the following is a characteristic of Type I (immediate) hypersensitivity reactions?

Accepted Answer

They involve IgE antibodies and can lead to anaphylaxis.

Question 18

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

Accepted Answer

They provide costimulatory signals (such as interleukin-2) required for activation of B cells and cytotoxic T cells.

Question 19

Which of the following best describes the process of opsonization?

Accepted Answer

Antibodies or complement proteins coat pathogens, enhancing their uptake by phagocytes.

The Immune System: Innate and Adaptive Body Defenses

Study Guide - Practice Questions