B cells have antigen receptors that bind to antigens that are either freely dissolved or present on the surface of invading or foreign cells. T cells have antigen receptors that _____
A) are active only in lymph nodes
B) bind only to antigens present on the surface of the invading or foreign cells
C) bind only to freely dissolved antigens in the plasma
D) bind to antigen fragments presented on major histocompatability (MHC) complexes by host cells
E) bind to antigens that are either freely dissolved or present on the surface of invading or foreign cells
Answer: D
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