Question 1

Which of the following best describes the difference between the primary and secondary adaptive immune responses?

Accepted Answer

The primary response is slower and mainly produces IgM, while the secondary response is faster and produces more IgG.

Question 2

A patient receives an injection of antiserum after exposure to rabies. Which type of immunity is this an example of?

Accepted Answer

Artificial passive immunity

Question 3

Which of the following best explains why proteins are generally more immunogenic than lipids?

Accepted Answer

Proteins contain more epitopes that can be recognized by lymphocytes.

Question 4

A child is born with a genetic defect that prevents the expression of MHC class I molecules. Which immune cell function would be most directly impaired?

Accepted Answer

Activation of CD8+ cytotoxic T cells

Question 5

Which antibody isotype is most abundant in serum during a secondary immune response?

Accepted Answer

IgG

Question 6

A patient with a deficiency in helper T cells (CD4+) would most likely have which of the following immune defects?

Accepted Answer

Impaired cellular and humoral immunity

Question 7

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

Accepted Answer

Activated lymphocytes proliferate and differentiate into effector and memory cells.

Question 8

A laboratory test detects high levels of IgM but low levels of IgG in a patient's serum. What does this most likely indicate?

Accepted Answer

The patient is in the early stages of a primary immune response.

Question 9

Which of the following is a function of cytotoxic T cells (CD8+)?

Accepted Answer

Killing infected cells using perforins and granzymes

Question 10

A hapten can only trigger an immune response when:

Accepted Answer

It is bound to a larger carrier molecule.

Question 11

Which of the following best describes the role of regulatory T cells (Treg)?

Accepted Answer

They suppress immune responses to maintain self-tolerance.

Question 12

Which of the following scenarios best illustrates natural passive immunity?

Accepted Answer

A child receives antibodies from breast milk.

Question 13

Which of the following is required for full activation of a naïve T cell?

Accepted Answer

Co-stimulation and recognition of antigen

Question 14

Which antibody isotype is primarily found in mucosal secretions and helps protect against pathogens at mucosal surfaces?

Accepted Answer

IgA

Question 15

A patient is exposed to a bacterial toxin. Which antibody function would most directly prevent the toxin from binding to host cells?

Accepted Answer

Neutralization

Question 16

Which of the following best explains why self-tolerance is important in adaptive immunity?

Accepted Answer

It prevents the immune system from attacking the body's own tissues.

Question 17

Which of the following is true regarding B cell activation?

Accepted Answer

T-dependent activation requires help from CD4+ T cells and produces strong memory.

Question 18

A patient with a genetic defect in the thymus would most likely have a deficiency in which cell type?

Accepted Answer

Helper T cells

Question 19

Which of the following best describes the structure of an antibody molecule?

Accepted Answer

Two heavy chains and two light chains, with variable regions that bind antigen

Question 20

A person receives a vaccine containing inactivated virus. Which type of immunity is this?

Accepted Answer

Artificial active immunity

Adaptive Immunity: Study Guide and Key Concepts

Study Guide - Practice Questions

Study Guide - Flashcards