Q: Which equation describes the rate of antibody production ($$A) $$during the secondary immune response compared to the primary response ($$P$$)?

$$A = r \times P$$ where $$r \u003e 1$$

Question 1

Which of the following best describes the mechanism by which HPV vaccines prevent cancer?

Accepted Answer

They stimulate the production of antibodies that bind to HPV antigens, preventing viral infection and subsequent cellular transformation.

Question 2

A splinter breaks the skin and introduces bacteria. Which sequence correctly describes the steps of the inflammatory response?

Accepted Answer

Mast cells release signaling molecules, capillaries dilate and become leaky, neutrophils migrate to the site, and phagocytosis occurs.

Question 3

Which equation best represents the relationship between the number of memory cells ($$M) $$produced and the number of exposures ($$E) to a $$specific antigen?

Accepted Answer

$$M = k 	imes E$$

Question 4

Why is it inaccurate to refer to a pathogen, such as a virus, as an antigen?

Accepted Answer

A pathogen is an organism or particle that causes disease, while an antigen is a specific molecule on the pathogen that elicits an immune response.

Question 5

A patient receives an antivenom shot after a snake bite. Why does this not confer lifelong immunity?

Accepted Answer

Antivenom provides passive immunity, which does not result in the formation of memory cells.

Question 6

Which of the following is a primary function of the lymphatic system during infection?

Accepted Answer

Returning tissue fluid to the circulatory system and fighting infection by housing white blood cells.

Question 7

What would be the main symptom of blockage of a large lymphatic vessel?

Accepted Answer

Swelling (edema) due to accumulation of tissue fluid.

Question 8

Which statement best explains the difference between the humoral and cell-mediated immune responses?

Accepted Answer

Humoral response targets pathogens in body fluids using antibodies, while cell-mediated response targets infected cells using cytotoxic T cells.

Question 9

Which equation describes the rate of antibody production ($$A) $$during the secondary immune response compared to the primary response ($$P$$)?

Accepted Answer

$$A = r 	imes P$$ where $$r \u003e 1$$

Question 10

Herd immunity can only work effectively if the level of immunization to a specific pathogen is maintained at what percentage or higher?

Accepted Answer

95%

Question 11

How does the structure of an antibody match its function?

Accepted Answer

Antibodies have antigen-binding sites that specifically bind to epitopes on antigens, marking pathogens for destruction.

Question 12

Scientists measure antibody levels after HPV vaccination to determine:

Accepted Answer

Whether immunity is waning and if a booster shot may be needed in the future.

Question 13

Helper T cells stimulate both humoral and cell-mediated immunity by:

Accepted Answer

Releasing signaling molecules that activate B cells and cytotoxic T cells.

Question 14

Cytotoxic T cells destroy infected body cells by:

Accepted Answer

Releasing perforin to form pores in the cell membrane and enzymes to trigger cell death.

Question 15

Why has it been difficult to develop a successful treatment for AIDS?

Accepted Answer

HIV mutates rapidly due to the lack of proofreading by reverse transcriptase, creating new strains resistant to treatment.

Question 16

The immune system identifies the body’s own molecules using:

Accepted Answer

Major histocompatibility complex (MHC) molecules, which act as molecular fingerprints.

Question 17

Allergies are caused by:

Accepted Answer

Hypersensitive responses to harmless environmental antigens called allergens.

Question 18

Which of the following best describes clonal selection?

Accepted Answer

The process by which lymphocytes with receptors specific for an antigen multiply into effector and memory cells.

Question 19

A patient with SCID (severe combined immunodeficiency) is unlikely to develop type 1 diabetes because:

Accepted Answer

SCID patients lack functional immune components, so they cannot mount autoimmune responses.

The Immune System: Innate and Adaptive Defenses

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