Question 1

Which of the following best describes the main difference between innate and adaptive immune responses?

Accepted Answer

Adaptive responses take longer to mount and are specific to particular antigens, while innate responses are rapid and non-specific.

Question 2

Which tissue is the primary site for T cell maturation?

Accepted Answer

Thymus

Question 3

A patient presents with swollen lymph nodes in the neck. What is the most likely explanation for this observation?

Accepted Answer

Leukocytes in the lymph nodes are multiplying in response to an invading microbe.

Question 4

Which of the following cells is classified as an agranulocyte and is highly phagocytic once matured?

Accepted Answer

Monocyte

Question 5

Which of the following best defines an antigen?

Accepted Answer

Any substance that, if presented in the right context, may trigger an immune response.

Question 6

Which of the following is NOT a function of the spleen?

Accepted Answer

Site of T cell maturation

Question 7

Which of the following statements about B and T cell receptors is TRUE?

Accepted Answer

Each B or T cell has thousands of receptors, all recognizing the same epitope.

Question 8

Which of the following best describes the role of antigen-presenting cells (APCs) in adaptive immunity?

Accepted Answer

APCs present antigens to T cells to initiate the adaptive immune response.

Question 9

Which of the following is a correct sequence of events in the adaptive immune response?

Accepted Answer

Antigen presentation → Lymphocyte activation → Lymphocyte proliferation and differentiation → Antigen elimination and memory

Question 10

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

Accepted Answer

They directly destroy virus-infected, damaged, or cancerous cells.

Question 11

Which of the following is an example of a complete antigen with high immunogenicity?

Accepted Answer

Hemagglutinin protein on influenza virions

Question 12

Which of the following best explains why secondary exposure to the same antigen is more effective?

Accepted Answer

Memory cells generated during the primary response enable a rapid and effective secondary response.

Question 13

Which of the following is a function of mucosa-associated lymphoid tissue (MALT)?

Accepted Answer

Sampling mucosal sites for antigens and fighting harmful microbes

Question 14

Which of the following best describes the role of helper T cells (CD4+ T cells) in the adaptive immune response?

Accepted Answer

They release cytokines that stimulate or suppress other white blood cells.

Question 15

Which of the following best describes the relationship between epitopes and antigens?

Accepted Answer

An antigen contains one or more epitopes, which are recognized by B and T cells.

Question 16

Which of the following best explains why the body can recognize an unlimited number of antigens?

Accepted Answer

The body produces a vast number of B and T cells, each with receptors for a unique epitope.

Question 17

Which of the following is a correct statement about lymphocytes?

Accepted Answer

They include B cells, T cells, and natural killer (NK) cells.

Question 18

Which of the following best describes the function of plasma cells?

Accepted Answer

They are effector B cells that secrete antibodies.

Question 19

Which of the following best describes the fate of effector cells after antigen elimination?

Accepted Answer

They die off, while memory cells remain in lymphatic tissues.

Question 20

Which of the following best describes the role of cytokines in the adaptive immune response?

Accepted Answer

They are signaling molecules that activate lymphocytes and coordinate the immune response.

Adaptive Immunity: Principles and Components

Study Guide - Practice Questions