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

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

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Immune System
Which of the following statements is false regarding B cells?

B cells can undergo class switching and produce a different antibody type
B cells that recognize high concentrations of antigens (self) in the absence of other signals undergo apoptosis in the bone marrow
B cells synthesize antibodies and put them on their cell surface
B one marrow stem cells migrate to the thymus and develop into B cells

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