ATI RN
Immune System Multiple Choice Questions and Answers PDF Questions
Question 1 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 2 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 3 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).
Question 4 of 5
After binding to an infected cell, the cytotoxic T cell
Correct Answer: D
Rationale: Cytotoxic T cells release perforin to lyse infected cells, not interleukin-1, phagocytosis, or neutralization.
Question 5 of 5
Which is the least abundant granulocyte in peripheral blood?
Correct Answer: A
Rationale: Basophils are the least abundant granulocytes in blood (<1%), unlike neutrophils (most abundant) or eosinophils; mast cells reside in tissues.