ATI RN
Immune System Exam Questions Questions
Question 1 of 5
All Characters of thymus parenchyma except
Correct Answer: C
Rationale: Thymus has a dark cortex , pale medulla with Hassall's corpuscles (B, D); white/red pulp is spleen-specific (C is incorrect).
Question 2 of 5
An important effector function of antibodies is opsonization. Opsonized antigen can bind to Fc receptors on for instance macrophages. Which part of the antibody binds to the Fc receptor?
Correct Answer: C
Rationale: The Fc region (tail of heavy chains, C) binds Fc receptors on macrophages; Fab and antigen-binding parts bind antigens.
Question 3 of 5
What is the function of TAP1 and TAP2 proteins?
Correct Answer: B
Rationale: TAP1/2 transport cytosolic peptides into the ER for MHC I loading ; invariant chain and CLIP are MHC II-related.
Question 4 of 5
What cytokine does a Th1 cell produce that influences B cells during class switching to produce IgG3?
Correct Answer: C
Rationale: IFN-γ from Th1 cells drives IgG3 class switching ; IL-4 favors IgE, TNF and IL-2 have other roles.
Question 5 of 5
How do NK cells recognize healthy cells?
Correct Answer: B
Rationale: NK cells spare healthy cells with MHC I ; opsonization is phagocytic, editing/selection (C, D) are lymphocyte processes.