Question

11. Memory T cells _____. (Select all that apply.) A. must all be activated in secondary lymphoid organs B. do not require co-stimulation through CD28 C. are composed only of CD4 T cells D. do not undergo somatic hypermutation E. are usually short-lived F. do not undergo isotype switching.

Answer 1

Answer: Activated by the binding of an antigen to a specific matching receptor on its surface, a B cell proliferates into a clone.