Question 1

Which of the following best describes the main function of innate immunity?

Accepted Answer

It provides a rapid, nonspecific defense against a broad range of pathogens.

Question 2

A patient consumes food contaminated with pathogenic bacteria but does not become ill due to the acidity of the stomach. This is an example of:

Accepted Answer

Innate immunity, which provides nonspecific immunity.

Question 3

Which of the following is NOT considered a first-line defense in innate immunity?

Accepted Answer

Phagocytosis by neutrophils.

Question 4

Keratin is important in the skin’s defense against infection because:

Accepted Answer

Keratin is hydrophobic, keeping the skin dry and decreasing microbial growth.

Question 5

Which of the following best describes the role of mucous membranes in innate immunity?

Accepted Answer

They trap and help remove microbes from body surfaces.

Question 6

Which of the following is a correct pairing of a physical barrier and its function in innate immunity?

Accepted Answer

Epidermis: sheds dead cells along with attached microbes.

Question 7

Which of the following is NOT a component or process associated with innate immunity?

Accepted Answer

Production of highly specific antibodies.

Question 8

A burn patient is at increased risk of infection primarily because:

Accepted Answer

The physical barrier of the skin is compromised, allowing microbes to enter.

Question 9

Which of the following best explains why the normal human microbiome is considered a first-line defense?

Accepted Answer

It competes with pathogens for space and nutrients, limiting their growth.

Question 10

Which of the following is a chemical barrier involved in innate immunity?

Accepted Answer

Lysozyme in saliva.

Question 11

A scientist is studying a new drug that increases the shedding of the outermost layer of skin cells. What effect would this likely have on microbial infection?

Accepted Answer

It would decrease infection by removing attached microbes more efficiently.

Question 12

Which of the following statements about the epidermis is correct?

Accepted Answer

It is composed of multiple layers of tightly packed epithelial cells.

Question 13

Which of the following is an example of a physical barrier in the first-line defense of innate immunity?

Accepted Answer

Mucous membranes lining the respiratory tract.

Question 14

Which of the following is NOT a function of the dermis in the skin?

Accepted Answer

Shedding dead cells to remove microbes.

Question 15

A patient with a genetic disorder that prevents the production of keratin would most likely experience which of the following?

Accepted Answer

Increased susceptibility to skin infections.

Question 16

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

Accepted Answer

Some components of innate immunity help activate and complement adaptive immunity.

Question 17

Which of the following is a correct statement about the layers of the skin?

Accepted Answer

The epidermis is the outermost layer and contains keratin-producing cells.

Question 18

Which of the following is an example of a chemical defense in the first-line of innate immunity?

Accepted Answer

Destructive acids in gastric juices.

Question 19

Which of the following best explains why the shedding of the outer layer of epidermal cells is important for innate immunity?

Accepted Answer

It removes attached microbes from the skin surface.

Question 20

Which of the following is NOT a function of the normal human microbiome in the context of innate immunity?

Accepted Answer

Producing highly specific antibodies against pathogens.

Innate Immunity: Physical Barriers and First-Line Defenses

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