Question 1

Which of the following best describes an epitope?

Accepted Answer

A three-dimensional region on an antigen recognized by the immune system

Question 2

Which of the following is an example of an endogenous antigen?

Accepted Answer

A viral protein produced inside an infected host cell

Question 3

What is the primary function of the major histocompatibility complex (MHC) proteins?

Accepted Answer

To hold and present antigenic epitopes to immune cells

Question 4

Which cells express MHC class II molecules on their surface?

Accepted Answer

Macrophages, B cells, and dendritic cells

Question 5

A patient is diagnosed with a viral infection. Which type of T cell is primarily responsible for killing the infected cells?

Accepted Answer

Cytotoxic T lymphocyte (CD8 cell)

Question 6

Which of the following statements about T cell receptors (TCRs) is correct?

Accepted Answer

TCRs only bind epitopes that are associated with an MHC protein

Question 7

Which process ensures that T cells do not attack the body’s own tissues?

Accepted Answer

Clonal deletion

Question 8

During T cell maturation, what happens to T cells that recognize autoantigens?

Accepted Answer

They undergo apoptosis

Question 9

Which of the following best describes the role of helper T lymphocytes (CD4 cells)?

Accepted Answer

They help regulate B cells and cytotoxic T cells

Question 10

A researcher is studying antigen processing. Which statement correctly distinguishes between endogenous and exogenous antigen processing?

Accepted Answer

Endogenous antigens are processed within infected cells and presented on MHC I, while exogenous antigens are processed by antigen-presenting cells and presented on MHC II

Question 11

Which of the following is NOT a function of regulatory T lymphocytes (Tr cells)?

Accepted Answer

Directly killing infected cells

Question 12

Which of the following best explains why large foreign macromolecules make the best antigens?

Accepted Answer

They have more complex three-dimensional structures, providing more epitopes for immune recognition

Question 13

A mutation causes a cell to lack MHC class I molecules. Which of the following would most likely occur?

Accepted Answer

Cytotoxic T cells would be unable to recognize and kill the cell

Question 14

Which of the following equations best represents the process of clonal deletion of T cells?

Accepted Answer

$$	ext{Immature T cells} \xrightarrow{	ext{recognize autoantigen}} 	ext{Apoptosis}$$

Question 15

Which of the following is a real-world example of an exogenous antigen?

Accepted Answer

A bacterial flagellum protein encountered by a macrophage

Question 16

Which of the following best describes the fate of a T cell that recognizes MHC protein but not a foreign epitope during maturation?

Accepted Answer

It undergoes apoptosis

Question 17

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

Accepted Answer

APCs present antigens on MHC class II molecules to helper T cells

Question 18

A patient with a genetic defect in MHC class II expression would most likely have problems with which immune function?

Accepted Answer

Activation of helper T cells

Question 19

Which of the following best explains why food and dust can sometimes trigger immune responses?

Accepted Answer

They may contain antigenic particles that are recognized as foreign by the immune system

Question 20

Which of the following best describes the relationship between T cell receptors (TCRs) and MHC proteins?

Accepted Answer

TCRs bind to epitopes only when they are presented by MHC proteins

Adaptive Immunity: Structure, Function, and Cellular Mechanisms

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