Question 1

Which of the following best describes the primary function of the skin as part of the immune system?

Accepted Answer

It acts as a physical and chemical barrier to prevent pathogen entry.

Question 2

A researcher is studying the effect of theromacin on bacterial populations. According to the provided graph, what is the most likely conclusion about theromacin's effect on Micrococcus luteus after 1 hour of incubation?

Accepted Answer

Theromacin significantly reduces the number of viable bacteria compared to the control.

Question 3

Which of the following is NOT a characteristic of innate immunity?

Accepted Answer

It generates immunological memory after exposure to a pathogen.

Question 4

During the process of phagocytosis, which step immediately follows the engulfment of a pathogen by a phagocytic cell?

Accepted Answer

Formation of a vacuole containing the pathogen.

Question 5

Neutrophils are the most abundant leukocytes in human blood. Which of the following best describes their role during an inflammatory response?

Accepted Answer

They are typically the first immune cells to arrive at the site of infection and perform phagocytosis.

Question 6

Which of the following best explains why adaptive immunity is considered 'specific'?

Accepted Answer

It involves the recognition of unique antigens by highly variable receptors on B and T cells.

Question 7

A patient is unable to produce functional B cells. Which of the following immune responses would be most directly impaired?

Accepted Answer

Production of antibodies against extracellular pathogens.

Question 8

Which process is responsible for generating the vast diversity of antibodies in humans?

Accepted Answer

Gene rearrangement and hypermutation during B cell development.

Question 9

What is the main function of the major histocompatibility complex (MHC) in adaptive immunity?

Accepted Answer

To display fragments of intracellular proteins on the cell surface for recognition by T cells.

Question 10

Which of the following best describes the process of opsonization?

Accepted Answer

Antibodies bind to pathogens, enhancing their recognition and uptake by phagocytes.

Question 11

A mutation prevents the deletion of T cells that recognize self-proteins in the thymus. What is the most likely consequence?

Accepted Answer

Increased risk of autoimmune diseases.

Question 12

Which of the following equations best represents the relationship between the number of possible antibody specificities ($$N$$), the number of variable ($$V$$), diversity ($$D$$), and joining ($$J) $$gene segments, assuming each segment can combine independently?

Accepted Answer

$$N = V 	imes D 	imes J$$

Question 13

Which of the following is a key difference between innate and adaptive immunity?

Accepted Answer

Adaptive immunity has memory and specificity, while innate immunity does not.

Question 14

During a local inflammatory response, which event occurs immediately after neutrophils adhere to the vascular endothelium?

Accepted Answer

Neutrophils exit the bloodstream by extravasation.

Question 15

Which of the following best explains why phagocytes generate toxic oxygen and nitrogen metabolites during an immune response?

Accepted Answer

To destroy engulfed pathogens within phagosomes.

Question 16

A patient is exposed to a pathogen for the second time. Which property of adaptive immunity allows for a faster and more effective response?

Accepted Answer

Immunological memory.

Question 17

Which of the following best describes the role of bone marrow stromal cells in B cell tolerance?

Accepted Answer

They present self-antigens to developing B cells, eliminating those that react strongly.

Question 18

Which of the following is a direct result of clonal expansion in B cells after activation?

Accepted Answer

Increased production of antibodies specific to the activating antigen.

Question 19

Which of the following best describes the interdependence of innate and adaptive immune mechanisms?

Accepted Answer

Innate immune responses can activate and enhance adaptive immune responses.

Innate and Adaptive Immunity: Mechanisms and Cellular Components

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