Question 1

Which of the following best describes the role of Toll-like receptors (TLRs) in innate immunity?

Accepted Answer

TLRs recognize pathogen-associated molecular patterns (PAMPs) and trigger cytokine release.

Question 2

A patient presents with a white blood cell count of 15,000/μl. Which of the following is the most likely explanation for this finding?

Accepted Answer

The patient may have a bacterial infection or an autoimmune disease.

Question 3

Which physical factor is most responsible for preventing microbial entry into the lower respiratory tract?

Accepted Answer

Epiglottis

Question 4

Which chemical factor found in tears and saliva is responsible for destroying bacterial cell walls?

Accepted Answer

Lysozyme

Question 5

During the process of phagocytosis, what is the function of opsonization?

Accepted Answer

It coats microorganisms with serum proteins to enhance adherence by phagocytes.

Question 6

Which of the following is a correct sequence of events during acute inflammation?

Accepted Answer

Vasodilation → Phagocyte migration → Tissue repair

Question 7

A deficiency in complement proteins would most likely result in which of the following?

Accepted Answer

Increased susceptibility to infections

Question 8

Which of the following best explains why fever can be beneficial during infection?

Accepted Answer

Fever slows the growth of pathogens and enhances immune cell function.

Question 9

Which of the following is NOT a function of antimicrobial peptides?

Accepted Answer

Promoting viral replication

Question 10

Which of the following statements about normal microbiota is TRUE?

Accepted Answer

Normal microbiota compete with pathogens for space and nutrients, helping prevent infection.

Question 11

Which of the following is a granulocyte that is most active in the early stages of infection and can leave the blood to enter infected tissue?

Accepted Answer

Neutrophil

Question 12

Which pathway of complement activation is triggered by antibodies binding to antigens?

Accepted Answer

Classical pathway

Question 13

Which of the following is a correct description of the role of interferons?

Accepted Answer

Interferons are cytokines that induce antiviral protein production in nearby cells.

Question 14

A patient with a genetic mutation that prevents the production of mannose-binding lectin (MBL) would have impaired activation of which complement pathway?

Accepted Answer

Lectin pathway

Question 15

Which of the following is a real-world example of genetic resistance to infectious disease?

Accepted Answer

Individuals with sickle cell trait are less susceptible to Plasmodium falciparum malaria.

Question 16

Which of the following best describes the process of diapedesis during inflammation?

Accepted Answer

Phagocytes squeeze between endothelial cells of blood vessels to reach the site of infection.

Question 17

Which of the following is a function of C3b in the complement system?

Accepted Answer

Promoting cytolysis and opsonization

Question 18

Which of the following is a plausible consequence of a cytokine storm?

Accepted Answer

Significant tissue damage and multi-organ dysfunction

Question 19

Which of the following is a correct statement about the role of iron-binding proteins in host defense?

Accepted Answer

Iron-binding proteins tightly bind iron, limiting its availability to pathogens.

Question 20

Which of the following is a correct application of the concept of microbial antagonism?

Accepted Answer

Normal microbiota produce substances that inhibit the growth of pathogenic microbes.

Innate Immunity: Nonspecific Defenses of the Host (Chapter 16 Study Notes)

Study Guide - Practice Questions

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