Question 1

Which of the following best describes the main physiological challenge that immunity solves in multicellular animals?

Accepted Answer

Distinguishing and eliminating non-self cells and organisms

Question 2

Which of the following is NOT a characteristic of innate immunity?

Accepted Answer

Use of a vast array of highly specific receptors

Question 3

A patient receives a vaccine containing inactivated viral particles. Which immune cells are primarily responsible for the long-term protection provided by this vaccine?

Accepted Answer

Memory B cells and memory T cells

Question 4

Which of the following best explains why the death rate from infectious diseases in the United States dropped sharply after the 1940s, as shown in the provided graph?

Accepted Answer

Introduction of antibiotics and vaccines

Question 5

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

Accepted Answer

Skin preventing bacterial entry

Question 6

A person is infected with a virus that enters and replicates inside their cells. Which immune response is primarily responsible for eliminating these infected cells?

Accepted Answer

Cell-mediated response by cytotoxic T cells

Question 7

Which of the following statements about the adaptive immune system is TRUE?

Accepted Answer

It recognizes specific traits of particular pathogens using a vast array of receptors

Question 8

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

Accepted Answer

They recognize conserved molecular patterns on pathogens

Question 9

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

Accepted Answer

Antigen recognition by B cell → B cell proliferation → Antibody secretion → Memory cell formation

Question 10

Which of the following best explains why a secondary immune response is faster and stronger than a primary response?

Accepted Answer

Memory cells generated during the primary response quickly recognize and respond to the antigen

Question 11

Which of the following is a real-world example of coevolution between a host and a pathogen?

Accepted Answer

A bacterium evolving resistance to antibiotics while the host immune system evolves new recognition mechanisms

Question 12

Which of the following is a function of antibodies in the immune response?

Accepted Answer

Neutralization of pathogens, opsonization, and recruitment of natural killer cells

Question 13

Which of the following best describes the difference between antigens and epitopes?

Accepted Answer

An antigen is a molecule that elicits an immune response, while an epitope is the specific part of the antigen recognized by receptors

Question 14

Which of the following is a plausible reason why the humoral immune response does not normally attack the body’s own cells?

Accepted Answer

Self-reactive B cells are eliminated or inactivated during development

Question 15

Which of the following best describes the 'testing effect' as it relates to learning biology?

Accepted Answer

Actively retrieving information through practice tests improves long-term retention

Question 16

A person is exposed to a new antigen (antigen C) for the first time. What is the expected immune response compared to a secondary exposure to a previously encountered antigen (antigen A)?

Accepted Answer

The response to antigen C will be slower and weaker than the secondary response to antigen A

Question 17

Which of the following is a key feature that allows adaptive immunity to 'adapt' to new pathogens?

Accepted Answer

Generation of a vast diversity of antigen receptors through gene rearrangement and mutation

Question 18

Which of the following is a correct statement about the role of cytokines in the immune response?

Accepted Answer

Cytokines secreted by helper T cells activate both humoral and cell-mediated immune responses

Question 19

Which of the following best explains why pathogens do not typically evolve to drive their hosts extinct?

Accepted Answer

Pathogen and host populations are engaged in a coevolutionary arms race, and host extinction would also threaten the pathogen’s survival

Defense & Immunity in Animals: Innate and Adaptive Immune Responses

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