T cells and B cells are produced in the A) bone marrow. B) thymus. C) Peyer's patches. D) nervous tissue. E) appendix. Question 6 Antigens may be processed for presentation by A) macrophages AND erythrocytes. B) dendritic cells AND erythrocytes. C) erythrocytes, macrophages, AND dendritic cells. D) T cytotoxic cells, B cells, AND dendritic cells. E) macrophages, B cells, AND dendritic cells. O A O E Question 7 Only antigen-presenting cells A) produce MHC class I molecules. B) produce MHC class II molecules. C) produce antibodies. D) activate cytotoxic T cells. E) activate regulatory T cells. O D Question 8 The stimulation of B cells to divide and mature is provided by A) T helper cells. B) macrophages. C)T cytotoxic cells. D) plasma cells. E) erythrocytes. O A O B O E