Question 1

Which of the following best describes the difference between primary and secondary lymphoid tissues in the immune system?

Accepted Answer

Primary lymphoid tissues are responsible for the maturation of immune cells, while secondary lymphoid tissues are sites where immune responses are initiated.

Question 2

A patient receives a vaccine containing inactivated viral particles. Which type of adaptive immune response is primarily activated?

Accepted Answer

Humoral immunity involving B cells and antibody production

Question 3

Which of the following best explains why the secondary immune response is faster and stronger than the primary immune response?

Accepted Answer

Memory B and T cells generated during the primary response recognize the antigen and respond more rapidly.

Question 4

Which of the following cells are responsible for producing antibodies?

Accepted Answer

Plasma cells (differentiated B cells)

Question 5

A patient receives a mismatched blood transfusion. Which immune mechanism is most likely responsible for the rapid destruction of the transfused red blood cells?

Accepted Answer

Antibody-mediated agglutination and complement activation against ABO antigens

Question 6

Which of the following best describes the role of Major Histocompatibility Complex (MHC) class I molecules?

Accepted Answer

They present endogenous antigens to cytotoxic T cells ($$CD8^+).$$

Question 7

Which of the following is a key function of helper T cells ($$CD4^+$$)?

Accepted Answer

Activating B cells and other immune cells by releasing cytokines

Question 8

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

Accepted Answer

IgG

Question 9

A child is exposed to chickenpox for the first time. Which of the following best describes the sequence of events in the adaptive immune response?

Accepted Answer

Naive B and T cells recognize the antigen, proliferate, and differentiate into effector and memory cells

Question 10

Which of the following best explains the significance of immunological memory?

Accepted Answer

It enables a faster and more effective response upon subsequent exposure to the same pathogen.

Question 11

Which of the following is a characteristic of the innate immune response?

Accepted Answer

It provides a rapid, non-specific defense against pathogens.

Question 12

Which of the following best describes the function of cytotoxic T cells ($$CD8^+$$)?

Accepted Answer

They directly kill virus-infected and cancerous cells.

Question 13

Which of the following is true regarding the difference between humoral and cell-mediated immunity?

Accepted Answer

Humoral immunity involves antibody production by B cells, while cell-mediated immunity involves T cells targeting infected cells.

Question 14

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

Accepted Answer

The recipient's immune system recognizes the donor's MHC molecules as foreign and mounts an immune response.

Question 15

Which of the following best describes the role of IgE antibodies?

Accepted Answer

They are involved in allergic reactions and defense against parasitic infections.

Question 16

A patient is exposed to a bacterial pathogen and develops a fever within hours. Which immune response is primarily responsible for this rapid reaction?

Accepted Answer

Innate immune response

Question 17

Which of the following best describes the process of antigen presentation?

Accepted Answer

Antigens are digested and displayed on the surface of antigen-presenting cells via MHC molecules.

Question 18

Which of the following is a function of regulatory T cells?

Accepted Answer

They suppress immune responses to prevent autoimmunity.

Question 19

Which of the following best explains the importance of the ABO blood group system in transfusions?

Accepted Answer

Mismatched ABO antigens can cause a severe immune reaction leading to hemolysis.

Question 20

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

Accepted Answer

They persist after an infection and enable a faster response upon re-exposure to the same antigen.

Chapter 24: The Immune System – Study Guide and Key Concepts

Study Guide - Practice Questions

Study Guide - Flashcards