Immune Response in biochemistry
In cellular immunity, T lymphocytes are responsible for the recognition and killing of foreign invaders. The cells are

killer T cells
None of these
cytotoxic T lymphocytes (CTL)
both (a) and (b)

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Immune Response in biochemistry
Immunological memory is due to

long lived B cells that secrete a specific antibody
long lived B cells that secrete a specific antigen
short lived helper T cells that signal macrophage to divide
short lived macrophage that can recognize specific pathogens

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