Immune System
Which of the following is correct for CD8 T cells?

CD8 T cells only recognize virus-infected cells
CD8 T cells can kill individual virus-infected cells in a contact dependent fashion
In the thymus, CD8 T cells undergo positive selection only, whereas CD4 T cells undergo negative selection only
CD8 T cell receptor recognizes epitopes that are also commonly recognized by B cells

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Immune System
T cell receptors (or TCR) on CD4+ T cells

recognize peptides associated with MHC class I molecules
are secreted out into the environment to bind antigens
recognize peptides not associated with MHC molecules
recognize peptides associated with MHC class II molecules

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