QCM : Innate Immunity and Viral Recognition — 9 questions

Questions et réponses du QCM

1. What does the innate immune response primarily refer to?

A rapid, non-specific defense mechanism that detects pathogens through conserved molecular patterns
A specialized immune response that only occurs after the adaptive immune system has been activated
A delayed, highly specific response involving memory cells that targets specific pathogens
The process by which immune cells develop long-term immunity after infection

A rapid, non-specific defense mechanism that detects pathogens through conserved molecular patterns

Explication

The innate immune response is characterized by its immediacy, non-specificity, and ability to recognize pathogens via conserved molecular patterns such as PAMPs. It does not involve memory cells or long-term specificity, which are features of adaptive immunity.

2. What is a defining characteristic of the innate immune response in terms of memory?

It generates long-lasting immunological memory that enhances future responses.
It does not generate memory and responds similarly upon each encounter.
It gradually develops memory after multiple exposures, but not immediately.
It only generates memory in certain cell types, such as macrophages.

It does not generate memory and responds similarly upon each encounter.

Explication

Innate immunity does not generate immunological memory; it reacts the same way each time, unlike adaptive immunity which enhances responses upon re-exposure.

3. Who proposed that Pattern Recognition Receptors recognize microbial motifs to activate immune responses?

Charles Janeway in 1989
Elie Metchnikoff in 1908
Louis Pasteur in 1885
Louis Pasteur in 1892

Charles Janeway in 1989

Explication

Charles Janeway is credited with proposing that pattern recognition receptors recognize microbial motifs (PAMPs) to activate innate immune responses, notably in his 1989 work.

4. Which of the following cell types is primarily involved in the immediate innate immune response?

B cells
Macrophages
Memory T cells
Plasma cells

Macrophages

Explication

Macrophages are key innate immune cells that respond immediately to pathogens, unlike B cells or T cells which are mainly part of the adaptive immune system.

5. What role do cytokines and chemokines play in innate immunity?

They suppress inflammation to prevent tissue damage.
They activate adaptive immune cells and promote inflammation.
They directly kill pathogens without involving other immune cells.
They mainly function as antibodies against microbes.

They activate adaptive immune cells and promote inflammation.

Explication

Cytokines and chemokines are signaling molecules that promote inflammation and activate other immune cells, facilitating a coordinated immune response.

6. Which receptor is known for recognizing viral RNA in the innate immune system?

Toll-like receptor 4 (TLR4)
RIG-I receptor
CD4 receptor
B cell receptor

RIG-I receptor

Explication

RIG-I receptor detects viral RNA inside cells, playing a critical role in recognizing viral infections within the innate immune response.

7. What is the primary purpose of inflammation initiated by innate immune recognition?

To inhibit all immune responses and prevent tissue damage.
To contain infection, recruit immune cells, and activate adaptive immunity.
To directly neutralize pathogens through antibody production.
To disable the pathogen's metabolism by direct attack.

To contain infection, recruit immune cells, and activate adaptive immunity.

Explication

Inflammation helps contain and eliminate infection, recruits immune cells to the site, and promotes activation of the adaptive immune system.

8. Who proposed that Pattern Recognition Receptors (PRRs) recognize microbial motifs to activate immune responses, and in what year?

Charles Janeway in 1989
Louis Pasteur in 1880
Louis Thomas in 1995
Shizuo Akira in 2000

Charles Janeway in 1989

Explication

Charles Janeway proposed the concept of PRRs recognizing microbial motifs in 1989, which was a foundational idea in innate immunity research.

9. What distinguishes innate immunity from adaptive immunity in terms of response timing?

Innate immunity responds within days, while adaptive is immediate.
Innate immunity responds immediately within minutes to hours, unlike the delayed adaptive response.
Both responses are equally rapid, but innate is more specific.
Adaptive immunity responds faster over multiple exposures, innate remains slow.

Innate immunity responds immediately within minutes to hours, unlike the delayed adaptive response.

Explication

Innate immune responses are immediate, occurring within minutes to hours after pathogen detection, whereas adaptive immunity takes about 6 days to develop.

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Innate immune response — role?

Immediate, non-specific defense against pathogens.

Immediate innate immune response — timing?

Occurs within minutes to hours after infection.

Pattern Recognition Receptors — function?

Detect microbial PAMPs to activate innate responses.

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