MHC class I vs. class II
Cytotoxic T cells recognize virus-infected cells by binding viral peptides presented on:
Answer B: explanation for every choice
A
MHC II on antigen-presenting cells presents external antigens to CD4⁺ helper T cells.
B
Correct. All nucleated cells present internal peptides on MHC I to CD8⁺ T cells.
C
B-cell receptors are surface antibodies that bind intact antigens.
D
Toll-like receptors are innate receptors for pathogen patterns.
TakeawayMHC I → CD8⁺ cytotoxic T cells. MHC II → CD4⁺ helper T cells.
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Reviewed 2026-11-05 by a medical student. Spot an error? Report it with question ID bb99.