Question 1

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

Accepted Answer

Innate immunity provides a rapid, non-specific response, while adaptive immunity provides a slower, specific response.

Question 2

Which cell type is primarily responsible for antigen presentation to T cells in the adaptive immune response?

Accepted Answer

Dendritic cells

Question 3

A patient is infected with a novel virus. Which of the following chemical signals is most likely to be produced early in the infection as part of the innate immune response?

Accepted Answer

Interferon-alpha (IFN-\alpha)

Question 4

Which of the following is a common strategy used by pathogens to evade the innate immune system?

Accepted Answer

Inhibiting phagosome-lysosome fusion within macrophages

Question 5

Which of the following best explains why adaptive immunity is considered to have 'memory'?

Accepted Answer

It generates long-lived lymphocytes that respond more rapidly upon re-exposure to the same antigen.

Question 6

A bacterial pathogen produces a capsule that prevents recognition by phagocytes. This is an example of which type of immune evasion?

Accepted Answer

Evasion of innate immunity by avoiding phagocytosis

Question 7

Which of the following chemical signals is most directly involved in the activation and proliferation of T cells during the adaptive immune response?

Accepted Answer

Interleukin-2 (IL-2)

Question 8

A patient with a genetic deficiency in natural killer (NK) cells would be most susceptible to which type of infection?

Accepted Answer

Viral infections and tumor formation

Question 9

Which of the following best describes the role of pattern recognition receptors (PRRs) in innate immunity?

Accepted Answer

They bind to conserved microbial structures known as pathogen-associated molecular patterns (PAMPs).

Question 10

A virus mutates its surface proteins to avoid detection by host antibodies. This is an example of:

Accepted Answer

Evasion of adaptive immunity by antigenic variation

Question 11

Which of the following is NOT a characteristic of the adaptive immune response?

Accepted Answer

Immediate response upon first exposure

Question 12

A patient is exposed to a bacterial toxin. Which innate immune cell is most likely to respond first by releasing granules containing antimicrobial peptides?

Accepted Answer

Neutrophils

Question 13

Which of the following best explains why the adaptive immune response is slower upon first exposure to a pathogen compared to the innate response?

Accepted Answer

Adaptive immunity requires clonal selection and expansion of specific lymphocytes.

Question 14

Which of the following is a major chemical signal produced by macrophages during the innate immune response to recruit other immune cells to the site of infection?

Accepted Answer

Interleukin-1 (IL-1)

Question 15

A patient is infected with a bacterium that secretes a protease degrading complement proteins. Which aspect of the immune system is being evaded?

Accepted Answer

Innate immunity by interfering with the complement cascade

Question 16

Which of the following best describes the function of cytotoxic T cells in adaptive immunity?

Accepted Answer

They directly kill infected host cells presenting antigen via MHC I.

Question 17

A patient with a deficiency in complement proteins would most likely have increased susceptibility to which of the following?

Accepted Answer

Bacterial infections due to impaired opsonization and lysis

Question 18

Which of the following is a key feature that distinguishes innate immune cells from adaptive immune cells?

Accepted Answer

Innate immune cells recognize a broad range of pathogens using germline-encoded receptors.

Question 19

A patient is infected with Mycobacterium tuberculosis, which survives within macrophages by preventing phagosome-lysosome fusion. Which immune process is being subverted?

Accepted Answer

Phagocytic killing by innate immune cells

Question 20

Which of the following best explains why vaccines are effective in preventing infectious diseases?

Accepted Answer

They induce the formation of memory cells in the adaptive immune system.

Innate and Adaptive Immunity: Key Concepts and Mechanisms

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