T Cells May Be Important for Recognition of Common Antigens

question 7

Multiple Choice

T cells may be important for recognition of common antigens at epithelial boundaries between the host and the external environment. The T cells differ from the αβ T cells in which one of the following ways?

• A) T cells recognize only nonprotein antigens.
• B) T cells are not MHC-restricted and do not recognize MHC-associated antigens.
• C)The TCR complex contains CD3ƴ or CD3Ϭ but not CD3Ϭ.
• D)Most mature T cells express either CD4 or CD8 but not both.
• E) T cells lack key biologic activities, including the ability to lyse target cells.

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