T cells bind with MHC molecules only when they are in association with a foreign antigen, and are responsible for cell-mediated immunity. This is because T cells recognize and respond to foreign peptides presented by MHC molecules on the surface of infected or abnormal cells, triggering a T cell response to eliminate the foreign antigen. T cells do not bind with free extracellular antigen, which is recognized by B cells.

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T Cells

Question 56

Multiple Choice

T cells

A) bind with free extracellular antigen
B) bind with MHC molecules only when they are in association with a foreign antigen
C) are responsible for cell-mediated immunity
D) bind with free extracellular antigen and are responsible for cell-mediated immunity
E) bind with MHC molecules only when they are in association with a foreign antigen, and are responsible for cell-mediated immunity

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