Question 1

Which of the following best describes the role of MHC complexes in the immune response?

Accepted Answer

MHC complexes present antigen fragments to T cells, enabling recognition and activation.

Question 2

A patient receives a kidney transplant. Which immune process is most likely to cause rejection of the organ?

Accepted Answer

Activation of T cells recognizing non-self MHC molecules on the transplanted organ.

Question 3

Which equation best represents the relationship between antibody concentration ($$[Ab]) $$and antigen binding sites ($$[Ag]) at $$equilibrium?

Accepted Answer

$$[Ab][Ag] = [AbAg]$$

Question 4

Which of the following is a key difference between the immune response to organ transplant and vaccination?

Accepted Answer

Organ transplant triggers a response against foreign MHC molecules, while vaccination introduces antigens to stimulate memory cell formation.

Question 5

A person with type 1 diabetes has an autoimmune disorder. Which mechanism is most responsible for the destruction of pancreatic beta cells?

Accepted Answer

T cells recognize self-antigens on beta cells and mediate their destruction.

Question 6

Which of the following best explains why viruses are often more difficult to treat than bacteria?

Accepted Answer

Viruses replicate inside host cells, making them less accessible to immune responses and drugs.

Question 7

During anaphylactic shock, which physiological change is most likely to occur?

Accepted Answer

Massive vasodilation and increased vascular permeability causing a drop in blood pressure.

Question 8

Which process describes clonal selection in the adaptive immune system?

Accepted Answer

Activation and proliferation of lymphocytes specific to a presented antigen.

Question 9

A patient with leukemia has an abnormally high number of immature white blood cells. How does this affect normal immune function?

Accepted Answer

It impairs immune responses due to dysfunctional and non-specialized white blood cells.

Question 10

Which of the following best describes the function of memory cells in the immune system?

Accepted Answer

Memory cells enable a faster and stronger immune response upon subsequent exposures to the same antigen.

Question 11

Which of the following is a primary function of antibodies?

Accepted Answer

Antibodies bind to antigens, neutralizing pathogens and marking them for destruction.

Question 12

Which equation represents the rate of antibody production ($$R) in $$response to antigen concentration ($$[Ag]) $$and clonal expansion factor ($$C$$)?

Accepted Answer

$$R = [Ag] 	imes C$$

Question 13

Which of the following is most likely to occur during an allergic response?

Accepted Answer

Release of histamine from mast cells leading to inflammation and symptoms.

Question 14

Which of the following best explains how vaccinations improve immune function?

Accepted Answer

Vaccinations stimulate the formation of memory cells specific to the pathogen without causing disease.

Question 15

A patient with rheumatoid arthritis experiences joint inflammation due to which immune mechanism?

Accepted Answer

Production of antibodies against joint cartilage (autoantibodies).

Question 16

Which of the following is a common feature of both autoimmune disorders and allergies?

Accepted Answer

Both involve inappropriate activation of the immune system against harmless targets.

Question 17

Which process allows B cells to help T cells decide which antigen to attack?

Accepted Answer

B cells present processed antigen fragments via MHC II to helper T cells, facilitating targeted immune responses.

Question 18

Which of the following is a plausible reason why autoimmune diseases can cripple the body?

Accepted Answer

The immune system attacks and destroys healthy tissues, impairing organ function.

Question 19

Which of the following best describes the specificity of the immune response?

Accepted Answer

Each antibody binds to a specific antigen due to its unique variable region.

Immunology: The Immune System, Disorders, and Responses

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