B cell antigen receptors bind to _____________, while T cell antigen receptors bind to _____________.
a. Antigens on pathogens; antigens presented on host cells
b. Antigens presented on host cells; antigens on pathogens
c. Antigens presented on host cells; antigens presented by B cells
d. Antigens on macrophage cells; antigens on pathogens
Answer: a. Antigens on pathogens; antigens presented on host cells