ATI RN
Immune System Multiple Choice Questions and Answers PDF Questions
Question 1 of 5
Lymphatic capillaries are able to receive cellular debris and foreign particles because
Correct Answer: A
Rationale: Flaplike valves (overlapping endothelial cells) in lymphatic capillaries allow debris entry; pressure , dual design , and amoeboid motion don't explain this.
Question 2 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 3 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 4 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.
Question 5 of 5
A molecule that can elicit an adaptive immune response is called
Correct Answer: D
Rationale: An antigen triggers adaptive immunity by being recognized by lymphocytes, unlike complement (innate), interferon (antiviral), or antibodies (response products).