ATI RN
Immune System Multiple Choice Questions and Answers Questions
Question 1 of 4
When an antigen-presenting cell (APC) presents an antigen to a T cell, it must
Correct Answer: D
Rationale: APCs present antigens via MHC to T cells.
Question 2 of 4
Regarding mast cells, which statement is false
Correct Answer: D
Rationale: Basophils are circulating, not tissue-high; morphine , IgE , and C5a are true.
Question 3 of 4
Which component is found in both the classical and alternative pathways and is central to complement activation?
Correct Answer: B
Rationale: C3 is central to both pathways; C1q is classical only, C5a and C9 are downstream.
Question 4 of 4
In order for a self-reactive T helper cell to respond to a self-peptide on MHC Class II, it must be activated and co-stimulated through:
Correct Answer: A
Rationale: B7-CD28 co-stimulates T cells; CD28 is on T cells, B7 on APCs, not reversed (B, D) or CD4 .