Question 1

Which of the following best describes the function of antibodies in the adaptive immune response?

Accepted Answer

They bind to antigens, tagging them for destruction by other immune cells.

Question 2

A patient receives an injection of antibodies against rabies virus after being bitten by a potentially rabid animal. Which type of immunity is this an example of?

Accepted Answer

Artificially acquired passive immunity

Question 3

Which of the following statements about the primary and secondary immune responses is correct?

Accepted Answer

The secondary response is faster and produces more antibodies due to the presence of memory cells.

Question 4

Which cell type is responsible for producing antibodies?

Accepted Answer

B lymphocytes

Question 5

A person develops immunity to chickenpox after recovering from the disease. What type of immunity is this?

Accepted Answer

Naturally acquired active immunity

Question 6

Which of the following best describes an autoantigen?

Accepted Answer

A molecule produced by the body that is mistakenly targeted by the immune system

Question 7

Which of the following is a key difference between humoral and cell-mediated immune responses?

Accepted Answer

Humoral response targets extracellular pathogens, while cell-mediated response targets infected host cells.

Question 8

Which of the following best describes the role of the Major Histocompatibility Complex (MHC) in adaptive immunity?

Accepted Answer

MHC molecules present antigen fragments to T cells, enabling recognition of infected or abnormal cells.

Question 9

A newborn receives antibodies from its mother through breast milk. Which type of immunity does this represent?

Accepted Answer

Naturally acquired passive immunity

Question 10

Which of the following scenarios best illustrates artificially acquired active immunity?

Accepted Answer

Receiving a tetanus vaccine and developing immunity

Question 11

Which of the following is NOT a function of antibodies?

Accepted Answer

Direct lysis of infected host cells

Question 12

A patient with a genetic defect cannot produce MHC molecules. Which process would be most directly impaired?

Accepted Answer

Antigen presentation to T cells

Question 13

Which of the following best explains why the secondary immune response is more effective than the primary response?

Accepted Answer

Memory B cells rapidly proliferate and produce large amounts of antibody upon re-exposure to the antigen.

Question 14

Which of the following is an example of an exogenous antigen?

Accepted Answer

A bacterial toxin present in the bloodstream

Question 15

A patient is exposed to a pathogen and develops a primary immune response. Which equation best represents the relationship between antibody concentration ($$A) $$and time ($$t) $$during the primary response?

Accepted Answer

$$A = \frac{A_{max} t}{K + t}$$, where $$A_{max} is $$maximum antibody concentration and $$K is a $$constant

Question 16

Which of the following best describes the process of antigen processing and presentation?

Accepted Answer

Antigens are digested into fragments and displayed on the cell surface by MHC molecules.

Question 17

A patient with an autoimmune disorder is most likely experiencing which of the following?

Accepted Answer

Immune response directed against the body's own antigens

Question 18

Which of the following best explains why vaccination is effective in preventing infectious diseases?

Accepted Answer

Vaccination stimulates the production of memory B cells that respond rapidly upon exposure to the pathogen.

Question 19

Which of the following is a characteristic of artificially acquired passive immunity?

Accepted Answer

It involves the injection of pre-formed antibodies.

Question 20

A laboratory test detects high levels of antibodies in a patient's serum following a booster vaccine. Which immune response is being measured?

Accepted Answer

Secondary (memory) immune response

Chapter 16: Adaptive Immunity – Specific Defense Mechanisms

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