ATI RN
Immune System Multiple Choice Questions and Answers PDF Questions
Question 1 of 5
What is delayed-type hypersensitivity (DTH)?
Correct Answer: A
Rationale: DTH involves memory Th1 cells reacting to a second exposure ; it's not immediate or non-specific .
Question 2 of 5
Adaptive immune responses are slow to develop, taking days to weeks after exposure to reach their peak. However, these responses are more specific than innate responses, and also generate immunological memory. These latter features, which provide enhanced protection upon re-infection with the same pathogen, are the basis of:
Correct Answer: A
Rationale: Vaccines exploit specificity and memory of adaptive immunity; antibiotics target bacteria, shock is a reaction, complement is innate.
Question 3 of 5
The alternative pathway of complement activation has an important role in innate immunity, due to its ability to greatly amplify the amount of C3b deposited onto the pathogen surface. This amplification occurs because:
Correct Answer: C
Rationale: C3b in the alternative convertase (C3bBb) generates more C3b , amplifying deposition; activity , solubility , or regulation don't explain this.
Question 4 of 5
Hepatitis C is a virus that infects hepatocytes, which are non-immune cells of the liver. Currently, patients with chronic Hepatitis C infections are treated with repeated administration of type I interferon, predominantly interferon α. One aspect of this treatment that might aid the patient's immune system in clearing this virus infection is:
Correct Answer: A
Rationale: Type I interferon boosts MHC I on hepatocytes , aiding CD8 T cells; macrophage action or inflammation are less direct.
Question 5 of 5
is a gaseous by-product of natural gas combustion plant hormone
Correct Answer: C
Rationale: Ethylene is a gaseous plant hormone, sometimes linked to combustion byproducts, while auxin and gibberellins are not gaseous.