which of the following among a-d is not a characteristic of t cells? a. like macrophages, cytotoxic t cells can also phagocytize cells. b. cytotoxic t cells respond to antigen bound to mhc class i molecules. c. certain t helper cells bind to and activate macrophages and dendritic cells. d. certain t helper cells activate b cells for antibody production. e. all the above are characteristics of t cells.
