Question 1

Which of the following best describes the concept of 'specificity' in adaptive immunity?

Accepted Answer

The immune system only responds to molecules with a specific three-dimensional shape.

Question 2

A patient receives a kidney transplant and experiences organ rejection. Which molecules are primarily responsible for this immune response?

Accepted Answer

Major histocompatibility complex (MHC) antigens

Question 3

Which of the following is a function of antibodies in the immune response?

Accepted Answer

Activating complement and inflammation

Question 4

A laboratory test detects high levels of IgM in a patient's serum after exposure to a pathogen. What does this indicate?

Accepted Answer

The patient is experiencing a primary immune response.

Question 5

Which of the following best explains why B cell receptors (BCRs) are highly diverse?

Accepted Answer

Each B cell generates a single BCR, but the population as a whole can recognize millions of different epitopes.

Question 6

Which class of antibody is most abundant in blood and is responsible for opsonization, agglutination, and crossing the placenta?

Accepted Answer

IgG

Question 7

A virus infects a cell and viral proteins are presented on the cell surface. Which MHC class presents these antigens and which T cell recognizes them?

Accepted Answer

MHC class I presents to cytotoxic T cells

Question 8

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

Accepted Answer

Directly neutralizing pathogens

Question 9

A patient with a parasitic infection shows elevated levels of a specific antibody. Which antibody class is most likely elevated?

Accepted Answer

IgE

Question 10

Which of the following best describes the process of clonal deletion?

Accepted Answer

The elimination of self-reactive lymphocytes through apoptosis

Question 11

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

Accepted Answer

APCs include dendritic cells, macrophages, and B lymphocytes.

Question 12

Which of the following is a key difference between B cell and T cell antigen recognition?

Accepted Answer

B cells recognize a variety of macromolecules, while T cells recognize only peptides presented by MHC.

Question 13

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

Accepted Answer

They regulate the activities of B cells and cytotoxic T cells through cytokine secretion.

Question 14

A patient is exposed to tetanus toxoid for the first time. Which antibody class will appear first in the serum?

Accepted Answer

IgM

Question 15

Which of the following is a characteristic of memory B cells?

Accepted Answer

They persist in lymphoid tissue and initiate rapid antibody production upon re-exposure to antigen.

Question 16

Which of the following best describes the function of perforin and granzymes released by cytotoxic T cells?

Accepted Answer

They induce apoptosis in infected target cells.

Question 17

Which of the following is true regarding the difference between naturally acquired and artificially acquired immunity?

Accepted Answer

Naturally acquired immunity results from infection or maternal antibodies, while artificially acquired immunity results from vaccination or antibody injection.

Question 18

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

Accepted Answer

Memory B cells and T cells respond rapidly upon re-exposure to the same antigen.

Question 19

Which of the following is a property of exogenous antigens?

Accepted Answer

They are found outside host cells and include bacterial toxins and parasites.

Question 20

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

Accepted Answer

They act as chemotactic cytokines that signal leukocytes to move toward sites of infection.

Adaptive Immunity: Structure, Function, and Mechanisms

Study Guide - Practice Questions

Study Guide - Flashcards