Q: Which equation best represents the process of opsonization?

$$\text{Bacterium} + \text{Complement protein} \rightarrow \text{Opsonized bacterium}$$

Question 1

Which of the following best describes the function of Toll-like receptors (TLRs) in innate immunity?

Accepted Answer

TLRs recognize pathogen-associated molecular patterns (PAMPs) and activate immune responses.

Question 2

A patient with a genetic mutation that prevents the formation of the membrane attack complex (MAC) would most likely have difficulty with which immune process?

Accepted Answer

Lysis of microbial cells by complement proteins

Question 3

Which of the following is a primary function of neutrophils in the immune system?

Accepted Answer

Engulfing and destroying marked bacteria via phagocytosis

Question 4

Which process is illustrated by the equation $$	ext{Antigen} + 	ext{Antibody} ightarrow 	ext{Antigen-antibody complex}$$?

Accepted Answer

Neutralization

Question 5

During inflammation, which sequence of events occurs first?

Accepted Answer

Release of inflammatory chemicals by damaged cells

Question 6

Which of the following best explains why skin is an effective barrier defense?

Accepted Answer

It produces secretions such as lysozyme and sweat that kill or inhibit bacteria.

Question 7

A macrophage that has phagocytosed a bacterium will present fragments of the bacterium on its surface using which molecule?

Accepted Answer

Class II MHC protein

Question 8

Which of the following is TRUE about the secondary immune response compared to the primary immune response?

Accepted Answer

Antibody levels peak more rapidly and at higher concentrations.

Question 9

Which equation best represents the process of opsonization?

Accepted Answer

$$	ext{Bacterium} + 	ext{Complement protein} ightarrow 	ext{Opsonized bacterium}$$

Question 10

Which of the following is a characteristic of passive humoral immunity?

Accepted Answer

It involves the injection of pre-formed antibodies.

Question 11

A person with Type I diabetes has an autoimmune disorder. Which cells are targeted by their immune system?

Accepted Answer

Islet cells of Langerhans in the pancreas

Question 12

Which of the following best describes the role of interferons in the immune response?

Accepted Answer

They signal neighboring cells to inhibit viral replication and activate immune cells.

Question 13

Which equation represents the activation of complement leading to cell lysis?

Accepted Answer

$$	ext{Antigen-antibody complex} + 	ext{Complement proteins} ightarrow 	ext{Membrane attack complex (MAC)} ightarrow 	ext{Cell lysis}$$

Question 14

Which of the following is required for the activation of helper T cells?

Accepted Answer

Binding to antigen presented by Class II MHC proteins and co-stimulation by cytokines

Question 15

Which of the following is a consequence of hypersensitivity reactions such as allergies?

Accepted Answer

Release of histamine from mast cells upon second exposure to allergen

Question 16

Which of the following best describes the process of clonal selection in the humoral immune response?

Accepted Answer

Activated B cells undergo rapid mitosis to produce plasma cells and memory cells.

Question 17

Which of the following is TRUE regarding antigen-presenting cells (APCs)?

Accepted Answer

APCs display antigen fragments on Class II MHC proteins to activate helper T cells.

Question 18

Which equation best represents the process of antibody-mediated opsonization?

Accepted Answer

$$	ext{Bacterium} + 	ext{Antibody} ightarrow 	ext{Opsonized bacterium}$$

Question 19

Which of the following is a function of natural killer (NK) cells in innate immunity?

Accepted Answer

They attack any cell lacking Class I MHC and release perforins to cause cell lysis.

The Immune System: Innate and Adaptive Defenses

Study Guide - Practice Questions

Study Guide - Flashcards