B-Cell Receptors Bind to Antigens That Are Either Freely Dissolved

Multiple Choice

B-cell receptors bind to antigens that are either freely dissolved or present on the surface of invading or foreign cells. T-cell receptors ________.

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 histocompatibility (MHC) complexes by host cells
E) bind to antigens that are either freely dissolved or present on the surface of invading or foreign cells