Question 1

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

Accepted Answer

The innate immune system recognizes general patterns, while the adaptive immune system recognizes specific molecular structures.

Question 2

Which of the following is NOT a physical barrier provided by the innate immune system?

Accepted Answer

Sebum

Question 3

A patient is infected with a Gram-negative bacterium. Which Toll-Like Receptor (TLR) is most likely to recognize a component of this pathogen?

Accepted Answer

TLR4

Question 4

Which of the following best explains why the innate immune response is considered 'non-specific'?

Accepted Answer

It uses pattern recognition receptors to detect common features of pathogens, not unique antigens.

Question 5

Which of the following is a function of the complement system in innate immunity?

Accepted Answer

Forming the Membrane Attack Complex (MAC) to lyse microbial cells.

Question 6

Which of the following equations best represents the activation of the complement system's central component?

Accepted Answer

$$\mathrm{C3} \rightarrow \mathrm{C3a} + \mathrm{C3b}$$

Question 7

Which cell type is primarily responsible for phagocytosis and the formation of pus at sites of infection?

Accepted Answer

Neutrophils

Question 8

A patient with a parasitic worm infection is likely to have an increase in which type of granulocyte?

Accepted Answer

Eosinophils

Question 9

Which of the following best describes the role of Pattern Recognition Receptors (PRRs) in the innate immune system?

Accepted Answer

They recognize Pathogen-Associated Molecular Patterns (PAMPs) to trigger immune responses.

Question 10

Which of the following is a correct pairing of a TLR and its recognized PAMP?

Accepted Answer

TLR4 — Lipid A in LPS

Question 11

Which of the following is NOT a typical sign of inflammation?

Accepted Answer

Pallor (paleness)

Question 12

Which of the following best explains why the response of the innate immune system does not improve upon repeated exposure to the same pathogen?

Accepted Answer

Innate immunity does not generate immunological memory.

Question 13

Which of the following is a chemical barrier that contributes to the first line of defense?

Accepted Answer

Sebum

Question 14

A patient is exposed to a virus. Which TLR is most likely to recognize double-stranded viral RNA?

Accepted Answer

TLR3

Question 15

Which of the following best describes the function of dendritic cells in the immune system?

Accepted Answer

They are professional antigen-presenting cells that bridge innate and adaptive immunity.

Question 16

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

Accepted Answer

Recognition → Alarm → Inflammation → Innate Cell Recruitment → Effector Function

Question 17

Which of the following best describes the role of chemokines in the innate immune response?

Accepted Answer

They control the localization and recruitment of immune cells.

Question 18

Which of the following is a function of Natural Killer (NK) cells in innate immunity?

Accepted Answer

They kill virus-infected or cancerous cells by recognizing changes in self-cell surface molecules.

Question 19

Which of the following best explains why the presence of specific immune cell types in tissues can be diagnostic of certain diseases?

Accepted Answer

Different immune cells accumulate in response to different types of pathogens or immune challenges.

Question 20

Which of the following best describes the process of phagocytosis?

Accepted Answer

The engulfment and digestion of microbes by immune cells such as macrophages and neutrophils.

Chapter 15

Study Guide - Practice Questions