Question 1

Which of the following best describes the difference between the innate and adaptive immune systems?

Accepted Answer

The innate immune system provides a general defense against a wide range of pathogens and acts immediately, while the adaptive immune system targets specific pathogens and is activated after the first encounter.

Question 2

A patient is infected with a virus that is replicating inside their own cells. Which immune cells are primarily responsible for destroying these infected cells?

Accepted Answer

Natural killer cells and cytotoxic T cells

Question 3

Which of the following is NOT a component of the innate immune system?

Accepted Answer

Antibodies

Question 4

During the inflammatory response, which sequence of events is correct?

Accepted Answer

Macrophages secrete signaling chemicals, mast cells release histamine, capillaries become leaky, neutrophils exit blood vessels

Question 5

Which of the following best explains why the immune system uses different strategies to defend against bacteria and viruses?

Accepted Answer

Viruses replicate inside host cells, so immune cells must destroy infected cells, while most bacteria are targeted in body fluids by phagocytosis.

Question 6

What is the primary function of antibodies in the adaptive immune system?

Accepted Answer

To mark pathogens for destruction by phagocytes

Question 7

Which of the following best describes the role of lymph nodes in the immune system?

Accepted Answer

They are sites where B cells, T cells, and macrophages screen lymph for microbes.

Question 8

A person receives a vaccine containing an inactivated virus. Which of the following best describes the immune response that follows?

Accepted Answer

The vaccine triggers the primary immune response, leading to clonal selection and the formation of memory B cells specific to the viral antigen.

Question 9

Which of the following statements about clonal selection is correct?

Accepted Answer

Clonal selection occurs when a B cell binds to its specific antigen, leading to the production of effector B cells and memory B cells.

Question 10

Which of the following best explains the difference between the primary and secondary immune responses?

Accepted Answer

The secondary response is faster and more robust due to the presence of memory B cells.

Question 11

A patient with rheumatoid arthritis is experiencing joint pain due to their immune system attacking their own connective tissue. This is an example of:

Accepted Answer

An autoimmune disorder

Question 12

Which of the following best describes the function of helper T cells?

Accepted Answer

They activate B cells and cytotoxic T cells.

Question 13

A person with a pollen allergy experiences sneezing and watery eyes when exposed to pollen. Which of the following best explains this reaction?

Accepted Answer

Their immune system mistakes pollen for a pathogenic microbe and mounts an immune response, causing collateral damage to healthy cells.

Question 14

Which of the following is a correct statement about the lymphatic system?

Accepted Answer

It returns excess interstitial fluid to the bloodstream and provides sites for immune cell screening of microbes.

Question 15

Which of the following best describes the role of mast cells in the inflammatory response?

Accepted Answer

They secrete histamine, causing capillaries to dilate and become leaky, allowing immune cells to reach the site of infection.

Question 16

Which of the following is true regarding antigen recognition in the immune system?

Accepted Answer

Each antibody binds to a specific antigen, allowing the immune system to target specific pathogens.

Question 17

A person is exposed to a pathogen for the second time. Which of the following best explains why they may not become ill?

Accepted Answer

Memory B cells from the first exposure rapidly produce antibodies, leading to a faster and more effective immune response.

Question 18

Which of the following best describes the function of neutrophils during an infection?

Accepted Answer

They phagocytose microbes and damaged tissue cells at the site of infection.

Question 19

Which of the following is a real-world example of the adaptive immune system in action?

Accepted Answer

A person receives a flu vaccine and later is exposed to the flu virus but does not get sick due to a rapid antibody response.

Question 20

Which of the following best explains why autoimmune disorders occur?

Accepted Answer

The immune system mistakenly recognizes self-antigens as non-self and attacks the body’s own cells.

Step-by-Step Guidance: Immunology and the Immune System

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