ATI RN
Questions on Immune System Questions
Question 1 of 5
Complete the following sentence. The cleavage of C3 and C5 results in the production of C3a and C5a fragments which are...
Correct Answer: D
Rationale: C3a and C5a are anaphylatoxins that trigger inflammation by recruiting immune cells, not forming MAC (C5b-C9) or opsonizing (C3b role).
Question 2 of 5
T cells that express γ δ chains:
Correct Answer: A
Rationale: γδ T cells have innate-like roles, often lack CD4/CD8, and recognize non-MHC antigens.
Question 3 of 5
Isotypes refers to variations in the:
Correct Answer: A
Rationale: Isotypes (e.g., IgG, IgM) differ in heavy chain constant regions ; variable regions (B, D) determine specificity, not isotype.
Question 4 of 5
Production of autoantibodies may be due to:
Correct Answer: D
Rationale: All (A, B, C) can cause autoantibodies; thus, D is correct.
Question 5 of 5
Which of the following immunoglobulin is the most abundant immunoglobulin in newborns?
Correct Answer: C
Rationale: IgG is abundant in newborns via maternal transfer; IgM rises later.