Question 1

Which of the following best describes how keratin contributes to the skin's role as a barrier to infection?

Accepted Answer

Keratin toughens the skin, making it more difficult for pathogens to penetrate.

Question 2

A patient develops a skin infection after scraping their knee. Which concept best explains how the infection occurred?

Accepted Answer

The skin was breached, providing a portal of entry for pathogens.

Question 3

Which of the following is a chemical barrier provided by the normal microbiota?

Accepted Answer

Production of antimicrobial peptides such as bacteriocins

Question 4

How do interferons help limit the spread of viral infections?

Accepted Answer

By inducing nearby cells to reduce transcription and translation, inhibiting viral replication

Question 5

Which of the following best describes the role of the skin's acidity in microbial defense?

Accepted Answer

It inhibits microbial growth by creating an unfavorable environment.

Question 6

A patient with a genetic disorder that prevents the production of antimicrobial peptides by their microbiota is likely to experience which of the following?

Accepted Answer

Decreased inhibition of pathogen growth

Question 7

Which of the following is NOT a function of interferons in antiviral defense?

Accepted Answer

Directly killing bacteria on the skin surface

Question 8

If the normal microbiota is disrupted by antibiotics, which of the following is a likely consequence?

Accepted Answer

Decreased competition for colonization sites, allowing pathogens to establish

Question 9

Which of the following best explains why constant cell renewal in the skin is important for microbial defense?

Accepted Answer

It removes attached microbes before they can penetrate deeper tissues.

Question 10

A virus infects a cell, which then begins to produce interferons. What is the next step in the antiviral response?

Accepted Answer

Nearby cells receive the interferon signal and reduce their transcription and translation.

Question 11

Which of the following scenarios best illustrates the concept of the skin as a portal of entry?

Accepted Answer

A person contracts tetanus after stepping on a rusty nail that punctures the skin.

Question 12

Which of the following equations best represents the reduction in viral replication due to interferon action?

Accepted Answer

$$R_v = R_0$ 	imes e$$^{-kt}$$

Question 13

A patient with a severe burn loses much of their skin barrier. Which of the following is the most likely consequence?

Accepted Answer

Increased risk of infection due to loss of the primary barrier

Question 14

Which of the following is an example of a physical barrier provided by the microbiome?

Accepted Answer

Competition with pathogens for colonization sites

Question 15

Which of the following best describes the sequence of events following viral infection of a cell?

Accepted Answer

Cell produces interferons → Interferons stimulate immune cells → Immune cells destroy virus-infected cells

Innate Immune Barriers: Skin, Microbiome, and Interferons

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