Question 1

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

Accepted Answer

Innate immunity provides a rapid, generic response to pathogens, while adaptive immunity develops after exposure and provides a specific response.

Question 2

Which of the following is NOT a barrier defense of the innate immune system in vertebrates?

Accepted Answer

Phagocytic cells

Question 3

A patient receives an injection of antibodies after being bitten by a venomous snake. This is an example of:

Accepted Answer

Passive adaptive immunity

Question 4

Which cell type is responsible for secreting antibodies during the adaptive immune response?

Accepted Answer

Plasma cells

Question 5

What is the primary function of natural killer (NK) cells in vertebrate innate immunity?

Accepted Answer

To detect and destroy abnormal or infected cells by releasing chemicals that induce cell death

Question 6

Which of the following best explains why vaccines are vital for global health?

Accepted Answer

They stimulate the adaptive immune system to produce memory cells, leading to long-term protection against specific pathogens.

Question 7

Which of the following is a key characteristic of the adaptive immune system that distinguishes it from the innate immune system?

Accepted Answer

It has immunological memory, allowing for a faster and stronger response upon second exposure to the same pathogen.

Question 8

A person develops a sore throat a day after being exposed to someone coughing nearby. Which part of the innate immune system is most likely responsible for the initial defense?

Accepted Answer

Mucous membranes and secretions in the respiratory tract

Question 9

Which of the following best describes the process of phagocytosis?

Accepted Answer

The engulfment and breakdown of foreign substances by phagocytic cells, followed by the fusion of a vacuole with a lysosome

Question 10

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

Accepted Answer

Pathogen entry → histamine release → blood vessel dilation → neutrophil recruitment

Question 11

Which of the following best describes the role of helper T cells in the adaptive immune response?

Accepted Answer

They activate both cytotoxic T cells and B cells by releasing cytokines.

Question 12

Which of the following is a real-world example of active adaptive immunity?

Accepted Answer

Being vaccinated against measles

Question 13

Which of the following statements about the complement system is correct?

Accepted Answer

It is activated by substances on pathogen surfaces and leads to the lysis of invading cells.

Question 14

A person who has recovered from chickenpox is exposed to the virus again years later but does not get sick. Which feature of the adaptive immune system explains this?

Accepted Answer

Immunological memory

Question 15

Which of the following best describes the difference between cell-mediated and antibody-mediated (humoral) immunity?

Accepted Answer

Cell-mediated immunity involves cytotoxic T cells destroying infected cells, while antibody-mediated immunity involves B cells producing antibodies to neutralize pathogens in body fluids.

Question 16

Which of the following is a function of interferons in the innate immune response?

Accepted Answer

They interfere with viral replication and help activate macrophages.

Question 17

Which of the following scenarios best illustrates the concept of immunological memory?

Accepted Answer

A person receives a booster vaccine and produces a rapid, strong antibody response.

Question 18

Which of the following is a unique feature of vertebrate innate immunity compared to invertebrate innate immunity?

Accepted Answer

Use of natural killer cells and an inflammatory response

Question 19

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

Accepted Answer

They bind to fragments of molecules characteristic of a set of pathogens, triggering innate immune responses.

Question 20

Which of the following is a possible complication of an excessive inflammatory response?

Accepted Answer

Septic shock, a life-threatening condition

Innate and Adaptive Immunity: Structure, Function, and Mechanisms

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