Question 1

Which of the following best describes an epitope?

Accepted Answer

A small region on an antigen that is specifically recognized by immune receptors

Question 2

Which antibody class is primarily produced during the primary immune response and is most effective at agglutination?

Accepted Answer

IgM

Question 3

A patient with a genetic defect that prevents the expression of MHC class I molecules would have the most difficulty with which immune function?

Accepted Answer

Killing virus-infected cells by cytotoxic T cells

Question 4

Which of the following is a feature that distinguishes adaptive immunity from innate immunity?

Accepted Answer

Memory

Question 5

What is the main function of the constant region (Fc region) of an antibody?

Accepted Answer

It interacts with immune cell receptors and complement proteins to mediate destruction of pathogens

Question 6

Which process explains how B and T lymphocytes can recognize billions of different epitopes?

Accepted Answer

Genetic recombination of receptor gene segments

Question 7

A person is exposed to the same pathogen twice. The second exposure results in a much faster and stronger antibody response. This is primarily due to:

Accepted Answer

The presence of memory B cells generated during the primary response

Question 8

Which antibody class is most abundant in serum and is capable of crossing the placenta to protect the fetus?

Accepted Answer

IgG

Question 9

Which of the following best describes the mechanism of neutralization by antibodies?

Accepted Answer

Antibodies bind to toxins or pathogens and block their interaction with host cells

Question 10

Which immune cell type is responsible for killing large pathogenic cells that are too big for phagocytosis via antibody-dependent cellular cytotoxicity (ADCC)?

Accepted Answer

Natural Killer (NK) cells

Question 11

A failure in which process is most likely to result in autoimmune disease?

Accepted Answer

Self-tolerance during lymphocyte development

Question 12

Which antibody class is primarily found in secretions such as tears, saliva, and breast milk, and is important for mucosal immunity?

Accepted Answer

IgA

Question 13

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

Accepted Answer

They secrete cytokines that coordinate and regulate the activities of other immune cells

Question 14

Which antibody class is most effective at activating the classical complement pathway?

Accepted Answer

IgM

Question 15

A patient with a parasitic worm infection is likely to have elevated levels of which antibody class?

Accepted Answer

IgE

Question 16

Which of the following is a direct result of antibody-mediated opsonization?

Accepted Answer

Enhanced phagocytosis of pathogens by macrophages

Question 17

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

Accepted Answer

Memory cells generated during the primary response rapidly proliferate and differentiate upon re-exposure to the antigen

Question 18

Which of the following is true regarding the recognition of antigens by T cell receptors (TCRs)?

Accepted Answer

TCRs recognize processed antigens only when presented by MHC molecules on the surface of other cells

Question 19

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

Accepted Answer

The activation and proliferation of lymphocytes that recognize a specific antigen

Question 20

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

Accepted Answer

They kill virus-infected cells by releasing perforins and granzymes

The Adaptive Immune System: Structure, Function, and Mechanisms

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