Q: Which equation best represents the rate of antibody production by plasma cells during a primary immune response?

$$ \text{Rate} = \frac{\text{Total antibodies produced}}{\text{Time (days)}} $$

Q: Which equation best represents the relationship between complement activation and cell lysis?

$$ \text{Cell lysis} \propto \text{Complement activation} $$

Question 1

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

Accepted Answer

TLRs recognize specific-shaped molecules on pathogens and trigger immune responses.

Question 2

A patient receives a mismatched blood transfusion and develops a reaction characterized by antibody-mediated lysis of red blood cells. Which type of hypersensitivity is this?

Accepted Answer

Cytotoxic hypersensitivity

Question 3

Which of the following is TRUE regarding the process of opsonization?

Accepted Answer

Opsonization involves coating pathogens with complement proteins or antibodies to enhance phagocytosis.

Question 4

Which immunoglobulin class is primarily responsible for passive immunity transferred from mother to fetus?

Accepted Answer

IgG

Question 5

During acute inflammation, which sequence correctly describes the steps of phagocyte mobilization?

Accepted Answer

Leukocytosis → Margination → Diapedesis → Chemotaxis

Question 6

A virus-infected cell releases interferons. What is the primary effect of these interferons on neighboring cells?

Accepted Answer

They stimulate neighboring cells to produce proteins that block viral replication and degrade viral RNA.

Question 7

Which equation best represents the rate of antibody production by plasma cells during a primary immune response?

Accepted Answer

$$ 	ext{Rate} = \frac{	ext{Total antibodies produced}}{	ext{Time (days)}} $$

Question 8

Which of the following is a key difference between active and passive humoral immunity?

Accepted Answer

Active immunity generates memory B cells, while passive immunity does not.

Question 9

A patient with a genetic defect resulting in a marked deficit of B and T cells is diagnosed with severe combined immunodeficiency (SCID). Which treatment is most likely to restore immune function?

Accepted Answer

Transplant of matched donor hematopoietic stem cells

Question 10

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

Accepted Answer

Fever increases metabolic rate, enhances T lymphocyte production, and suppresses bacterial growth by limiting access to iron.

Question 11

Which of the following is TRUE regarding antigenic determinants?

Accepted Answer

Antigenic determinants are specific regions of an antigen that antibodies or lymphocyte receptors bind to.

Question 12

Which equation best represents the relationship between complement activation and cell lysis?

Accepted Answer

$$ 	ext{Cell lysis} \propto 	ext{Complement activation} $$

Question 13

Which of the following is a function of regulatory T cells?

Accepted Answer

Regulatory T cells suppress immune responses and help prevent autoimmune reactions.

Question 14

A patient develops an autoimmune disease after a streptococcal infection. Which mechanism best explains this phenomenon?

Accepted Answer

Antibodies produced against the streptococcal antigen cross-react with self-antigens, leading to tissue damage.

Question 15

Which of the following is NOT a mechanism by which antibodies help eliminate pathogens?

Accepted Answer

Directly lysing pathogens without the involvement of other immune components

Question 16

Which equation best represents the concept of immunological memory in humoral immunity?

Accepted Answer

$$ 	ext{Secondary response} = 	ext{Memory cell activation} 	imes 	ext{Antigen exposure} $$

Question 17

Which of the following is TRUE regarding the activation of cytotoxic T cells?

Accepted Answer

Cytotoxic T cells are activated by antigens presented on class I MHC proteins and require co-stimulatory signals.

Question 18

Which of the following best describes the role of helper T cells in adaptive immunity?

Accepted Answer

Helper T cells activate B cells, other T cells, and macrophages, and direct the adaptive immune response.

Question 19

A patient is exposed to poison ivy and develops a skin reaction 2 days later. Which type of hypersensitivity is this?

Accepted Answer

Delayed hypersensitivity

Chapter 21: The Immune System – Innate and Adaptive Body Defenses

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