Question 1

Which of the following best defines a pathogen?

Accepted Answer

An organism or virus that causes disease in its host.

Question 2

Which statement correctly distinguishes between innate and adaptive immunity?

Accepted Answer

Innate immunity provides a rapid, non-specific response, while adaptive immunity provides a slower, specific response.

Question 3

Which type of white blood cell is primarily responsible for producing antibodies?

Accepted Answer

B lymphocytes (B cells)

Question 4

Which of the following is a key difference between the immune systems of invertebrates and vertebrates?

Accepted Answer

Vertebrates have adaptive immunity, while invertebrates rely solely on innate immunity.

Question 5

Which of the following best describes a barrier defense in the immune system?

Accepted Answer

The skin acting as a physical shield against pathogens.

Question 6

What is the primary function of neutrophils in the mammalian immune system?

Accepted Answer

To engulf and destroy invading bacteria and fungi.

Question 7

Which of the following events occurs first during the inflammatory response?

Accepted Answer

Histamine is released by mast cells, increasing blood vessel permeability.

Question 8

A patient with a genetic disorder lacks functional T cells. Which aspect of their immune response would be most affected?

Accepted Answer

The ability to mount a specific, adaptive immune response.

Question 9

Which of the following is an example of an internal defense in innate immunity?

Accepted Answer

The activity of natural killer (NK) cells destroying infected cells.

Question 10

Which white blood cell type is most directly involved in the destruction of virus-infected cells?

Accepted Answer

Cytotoxic T cells

Question 11

Which of the following best explains why the skin is considered a barrier defense?

Accepted Answer

It acts as a physical and chemical shield, preventing pathogen entry.

Question 12

Which of the following is a correct sequence of events in the inflammatory response?

Accepted Answer

Pathogen entry → histamine release → increased blood flow → phagocyte migration

Question 13

Which of the following best describes the role of macrophages in the immune system?

Accepted Answer

They engulf and digest pathogens and present antigens to T cells.

Question 14

Which of the following is a key feature of adaptive immunity that is not present in innate immunity?

Accepted Answer

Immunological memory, allowing for a faster response upon re-exposure.

Question 15

A person receives a cut on their hand. Which immune response is most likely to occur first?

Accepted Answer

Release of histamine and initiation of inflammation.

Question 16

Which of the following is NOT a function of white blood cells in the mammalian immune system?

Accepted Answer

Transporting oxygen to tissues.

Question 17

Which of the following best describes the difference between barrier defenses and internal defenses?

Accepted Answer

Barrier defenses prevent pathogen entry, while internal defenses act after pathogens have entered the body.

Question 18

Which of the following is a real-world example of innate immunity in action?

Accepted Answer

A cut on the skin becomes red and swollen due to inflammation.

Question 19

Which of the following best explains why adaptive immunity is slower to respond than innate immunity?

Accepted Answer

Adaptive immunity relies on the production and selection of specific lymphocytes.

Question 20

Which of the following is a function of eosinophils in the immune system?

Accepted Answer

Releasing enzymes to combat multicellular parasites.

Innate Immunity and the Mammalian Immune System: Key Concepts and Functions

Study Guide - Practice Questions