Question 1

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

Accepted Answer

Innate immunity provides generalized, nonspecific defense mechanisms, while adaptive immunity tailors responses to specific pathogens and exhibits memory.

Question 2

A patient with a genetic disorder affecting their bone marrow is likely to have deficiencies in which aspect of their immune system?

Accepted Answer

Production and maturation of leukocytes, affecting both innate and adaptive immunity

Question 3

Which of the following is NOT considered a first-line defense against pathogens?

Accepted Answer

Complement protein cascade

Question 4

A germ-free animal is found to have an underdeveloped gut immune system. What does this observation best support?

Accepted Answer

The role of normal microbiota in stimulating immune system development

Question 5

Which of the following best explains why a cut in the skin can lead to infection despite the presence of immune defenses?

Accepted Answer

The cut bypasses first-line physical barriers, allowing pathogens to access second-line defenses directly.

Question 6

Which of the following is a function of antimicrobial peptides (AMPs) in the innate immune system?

Accepted Answer

They directly disrupt pathogen plasma membranes and stimulate leukocytes.

Question 7

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

Accepted Answer

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

Question 8

Which of the following leukocytes is most abundant in the blood and is the first to arrive at sites of tissue injury?

Accepted Answer

Neutrophils

Question 9

A patient with chronic inflammation is found to have elevated monocyte counts. What is the most likely role of these cells in the immune response?

Accepted Answer

They phagocytize pathogens and activate the adaptive immune system.

Question 10

Which of the following best describes the function of chemokines?

Accepted Answer

They are signaling proteins that attract white blood cells to sites of infection through chemotaxis.

Question 11

A viral infection triggers the release of interferons (IFNs) from infected cells. What is the primary effect of these molecules?

Accepted Answer

They stimulate nearby uninfected cells to mount antiviral defenses.

Question 12

Which of the following is a direct outcome of complement system activation?

Accepted Answer

Formation of a membrane attack complex (MAC) that causes cytolysis

Question 13

A patient with a fever of 39°C (102.2°F) is being monitored. According to the study materials, which of the following is a potential benefit of this low-grade fever?

Accepted Answer

It enhances antiviral effects of interferons and increases phagocyte efficiency.

Question 14

Which of the following is a cardinal sign of inflammation?

Accepted Answer

Swelling (edema)

Question 15

A patient is found to have leukocytosis with elevated eosinophil counts. Which of the following is the most likely noncancerous cause?

Accepted Answer

Allergy or parasitic infection

Question 16

Which of the following best explains the role of the spleen in the immune system?

Accepted Answer

It filters blood, removes damaged erythrocytes, and allows leukocytes to look for invaders.

Question 17

Which of the following is a correct sequence of events during the inflammatory response?

Accepted Answer

Vascular changes, leukocyte recruitment, resolution

Question 18

A patient with a body temperature of 41°C (105.8°F) is not responding to treatment. According to the study materials, what is the most immediate concern?

Accepted Answer

Essential cellular enzymes and proteins may denature, making this a medical emergency.

Question 19

Which of the following best describes the function of iron-binding proteins in the immune response?

Accepted Answer

They limit microbial growth by reducing available iron in circulation and tissues.

Question 20

A patient is exposed to a new pathogen. Which immune response will be activated first, and what is a key feature of this response?

Accepted Answer

Innate immunity; it provides a rapid, nonspecific response.

Innate Immunity: Overview and Key Concepts

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