Which statement is true?

Question

Quizplus · Accepted Answer

Cytotoxic T cells use the CD8 protein to ensure binding to an MHC-antigen complex. Choice A is incorrect because there is actually high polymorphism at MHC loci in humans. Choice B is incorrect because cytotoxic T cell receptors recognize antigenic fragments only when they are bound to class I MHC molecules, not class II. Choice C is incorrect because T-helper cells have a surface protein called CD4 that binds to antigen-class II MHC complexes. Choice E is incorrect because T-helper cells bind to antigen-class II MHC complexes, not cell surface antigens.

Which Statement Is True