Question 1

Which of the following best distinguishes innate immunity from adaptive (acquired) immunity?

Accepted Answer

Innate immunity is present from birth and responds rapidly to a broad range of pathogens, while adaptive immunity develops more slowly and targets specific pathogens.

Question 2

Which immune system is universal to all organisms, including invertebrates and plants?

Accepted Answer

Innate immune system

Question 3

Phagocytosis is a key process in innate immunity. Which of the following best describes phagocytosis?

Accepted Answer

The engulfment and digestion of pathogens or debris by certain white blood cells.

Question 4

Which of the following is NOT a type of phagocytic leukocyte?

Accepted Answer

Erythrocyte

Question 5

How do phagocytic leukocytes recognize microbes as foreign?

Accepted Answer

They detect pathogen-associated molecular patterns (PAMPs) using pattern recognition receptors (PRRs).

Question 6

Which of the following best describes the role of interferons in innate immunity?

Accepted Answer

Interferons are proteins released by virus-infected cells that help limit the spread of viruses to neighboring cells.

Question 7

Which of the following events is NOT part of the inflammatory response?

Accepted Answer

Production of antibodies by B cells

Question 8

How do natural killer (NK) cells differ from phagocytes in their action against infected cells?

Accepted Answer

NK cells induce apoptosis in infected or abnormal cells, while phagocytes engulf and digest pathogens.

Question 9

Which component of innate immunity is primarily responsible for distinguishing self from non-self?

Accepted Answer

Pattern recognition receptors (PRRs) on phagocytic cells

Question 10

Which of the following best describes the relationship between antigens and antibodies?

Accepted Answer

Antibodies are proteins that specifically bind to antigens to help neutralize or eliminate them.

Question 11

What is the difference between an antigen and an epitope?

Accepted Answer

An antigen is any molecule that elicits an immune response, while an epitope is the specific part of the antigen recognized by an antibody or receptor.

Question 12

Which of the following statements correctly compares B lymphocytes and T lymphocytes?

Accepted Answer

B lymphocytes produce antibodies, while T lymphocytes can directly kill infected cells or help other immune cells.

Question 13

Why are antigen receptors of lymphocytes tested for self-reactivity during development?

Accepted Answer

To prevent the immune system from attacking the body's own tissues, which could lead to autoimmune diseases.

Question 14

If self-reactive lymphocytes were not eliminated during development, what would most likely occur?

Accepted Answer

The individual would be at increased risk for autoimmune diseases.

Question 15

Which of the following best describes the mechanism of clonal selection in adaptive immunity?

Accepted Answer

When a lymphocyte binds its specific antigen, it proliferates and differentiates into effector and memory cells.

Question 16

What is the main difference between effector cells and memory cells produced during clonal selection?

Accepted Answer

Effector cells act immediately to combat the pathogen, while memory cells persist to provide a faster response upon future exposure.

Question 17

Which of the following best explains the cellular basis for immunological memory?

Accepted Answer

Long-lived memory cells remain in the body after an initial infection and can rapidly respond to subsequent exposures to the same antigen.

Question 18

Which of the following correctly distinguishes between humoral and cell-mediated immune responses?

Accepted Answer

Humoral response involves antibodies produced by B cells, while cell-mediated response involves cytotoxic T cells attacking infected cells.

Question 19

Which of the following is an example of passive immunity?

Accepted Answer

A newborn receiving antibodies from its mother through breast milk.

Question 20

Which of the following is NOT a way that antibodies mediate antigen disposal?

Accepted Answer

Directly lysing pathogens without the help of other immune components.

Study Guide: The Immune System (Innate and Adaptive Immunity)

Study Guide - Practice Questions

Study Guide - Flashcards