Question 1

Which of the following best explains why the secondary immune response is faster and stronger than the primary response?

Accepted Answer

Because memory lymphocytes generated during the primary response rapidly recognize and respond to the antigen.

Question 2

A patient receives an injection of antiserum after exposure to a toxin. Which type of immunity is this an example of?

Accepted Answer

Artificial passive immunity

Question 3

Which of the following statements about antigen presentation is correct?

Accepted Answer

MHC I molecules present intracellular antigens to CD8+ T cells.

Question 4

A laboratory test shows a high concentration of IgM antibodies in a patient's serum. What does this most likely indicate?

Accepted Answer

The patient is in the early stages of a primary immune response.

Question 5

Which of the following best describes the function of cytotoxic T cells (CD8+)?

Accepted Answer

They kill infected cells by releasing perforins and granzymes.

Question 6

A child is born with a genetic defect that prevents the formation of MHC II molecules. Which of the following immune functions would be most directly impaired?

Accepted Answer

Activation of helper T cells

Question 7

Which antibody isotype is most abundant in the blood during a secondary immune response?

Accepted Answer

IgG

Question 8

A hapten can only trigger an immune response when:

Accepted Answer

It is bound to a carrier protein.

Question 9

Which of the following best describes the process of clonal expansion?

Accepted Answer

The proliferation and differentiation of activated lymphocytes into effector and memory cells.

Question 10

A patient with a deficiency in helper T cells (CD4+) would most likely have problems with which of the following?

Accepted Answer

Coordinating both cellular and humoral immune responses

Question 11

Which of the following is a function of antibodies in the immune response?

Accepted Answer

Activating complement proteins to lyse pathogens

Question 12

Which of the following best explains why proteins are generally more immunogenic than lipids?

Accepted Answer

Proteins are larger and have more complex structures, providing more epitopes for immune recognition.

Question 13

A vaccine stimulates the body to produce its own antibodies and memory cells. This is an example of:

Accepted Answer

Artificial active immunity

Question 14

Which of the following is true regarding B cell activation?

Accepted Answer

T-dependent activation requires help from CD4+ T cells and results in strong memory formation.

Question 15

A patient is exposed to a pathogen for the first time. Which antibody isotype will be produced first?

Accepted Answer

IgM

Question 16

Which of the following best describes the role of regulatory T cells (Treg)?

Accepted Answer

They suppress immune responses to maintain self-tolerance.

Question 17

A newborn receives antibodies from its mother through breast milk. This is an example of:

Accepted Answer

Natural passive immunity

Question 18

Which of the following best explains why self-tolerance is important in adaptive immunity?

Accepted Answer

It prevents the immune system from attacking the body's own tissues.

Question 19

A researcher is studying a lymphocyte that recognizes only one specific epitope. This is an example of which principle?

Accepted Answer

Lymphocyte specificity

Question 20

A patient is infected with a virus that replicates inside host cells. Which branch of adaptive immunity is primarily responsible for eliminating these infected cells?

Accepted Answer

Cellular immunity

Adaptive Immunity: Study Guide and Key Concepts

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