What is the role of helper T cells in the adaptive immune response?
a. Helper T cells directly kill infected host cells.
b. Helper T cells activate B cells and cytotoxic T lymphocytes to kill infected host cells.
c. Helper T cells phagocytize bacteria and viruses.
d. Helper T cells produce and secrete antibodies.
Ans: b. Helper T cells activate B cells and cytotoxic T lymphocytes to kill infected host cells.
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Fill in the blank(s) with the appropriate word(s).