Final answer:
Plasma cells that produce antibodies originate from B cells, not T-helper cells, therefore, the statement is false. T-helper cells assist B cells but do not produce antibodies themselves.
Step-by-step explanation:
The statement that a plasma cell is a mature T-helper cell that produces antibodies is false. Plasma cells are, in fact, derived from B cells. When B cells are stimulated by antigens with the help of helper T cells, they can differentiate into plasma cells or memory B cells. Plasma cells are the cells responsible for the production and secretion of antibodies. Memory B cells, on the other hand, retain the antigenic information for quicker and stronger responses upon subsequent exposures to the same pathogen. The role of T-helper cells is to help B cells differentiate and to secrete cytokines that stimulate other aspects of the immune response, but they do not produce antibodies themselves.