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 activate immune responses.

Question 2

A patient presents with a significantly reduced white blood cell count. Which of the following is the most likely implication for their health?

Accepted Answer

They are at increased risk for infections due to impaired immunity.

Question 3

Which physical factor is most directly involved in preventing microbial entry into the human body?

Accepted Answer

Intact skin barrier

Question 4

Normal microbiota contribute to immunity primarily by:

Accepted Answer

Competing with pathogens for nutrients and space.

Question 5

Which of the following cell types is primarily responsible for phagocytosis in the blood?

Accepted Answer

Neutrophils

Question 6

The lymphatic system contributes to immunity by:

Accepted Answer

Filtering lymph and housing immune cells for pathogen detection.

Question 7

Why are there two types of macrophages (fixed and wandering) in the body?

Accepted Answer

To provide both localized and systemic defense against pathogens.

Question 8

Which of the following best describes the process of phagocytosis?

Accepted Answer

The engulfment and digestion of microbes by immune cells.

Question 9

A fever can be beneficial during infection because:

Accepted Answer

It enhances the activity of immune cells and inhibits pathogen growth.

Question 10

What is the primary outcome of the complement system activation?

Accepted Answer

Destruction of pathogens via membrane attack complex formation.

Question 11

Interferons protect neighboring cells from viral infection by:

Accepted Answer

Inducing antiviral protein production in nearby cells.

Question 12

Iron-binding proteins influence immunity by:

Accepted Answer

Sequestering iron to limit microbial growth.

Question 13

Which of the following is a characteristic of antimicrobial peptides?

Accepted Answer

They are short peptides that disrupt microbial membranes.

Question 14

A patient with a skin wound develops redness, heat, swelling, and pain. These symptoms are most characteristic of:

Accepted Answer

Inflammation

Question 15

Which chemical factor in human tears contributes to immunity by breaking down bacterial cell walls?

Accepted Answer

Lysozyme

Question 16

Which of the following equations best represents the rate of phagocytosis ($$R) as a $$function of the number of phagocytes ($$N) $$and the concentration of pathogens ($$P$$), assuming a proportional relationship?

Accepted Answer

$$R = k 	imes N 	imes P$$

Question 17

A patient is exposed to a bacterial pathogen. Which sequence best describes the order of events in innate immunity?

Accepted Answer

Physical barrier breach → Phagocytosis → Inflammation → Complement activation

Question 18

Which of the following is NOT a protective measure against microbes?

Accepted Answer

Increased glucose uptake by cells

Question 19

If a mutation causes a deficiency in complement proteins, which of the following is the most likely consequence?

Accepted Answer

Reduced ability to lyse pathogens and increased susceptibility to infections.

Question 20

Which of the following best explains why normal microbiota are considered part of the first line of defense in immunity?

Accepted Answer

They occupy niches and prevent colonization by pathogens.

Innate Immunity: Mechanisms and Components

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