If a pathogen passes the initial external defences and invades the body
A) internal specific defence mechanisms are activated.
B) interleukin-2 is produced by natural killer cells to expand the initial response.
C) monocytes release perforins which punch holes in the membranes of infected cells.
D) phagocytic cells engulf particles and kill the invading organisms.
E) macrophages are attracted to the site of infection and activate the complement cascade.
Correct Answer:
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Q29: In plants
A) immune defence is similar to
Q30: Complement is
A) a series of about 20
Q31: Evolution of the immune system has resulted
Q32: T-cell receptors (TCR) and Immunoglobulins (Ig) are
Q33: Innate defence mechanisms are
A) only relevant to
Q35: Complement is
A) produced by macrophages in response
Q36: Dendritic cells are
A) the central cells of
Q37: A fundamental requirement of any immune defence
Q38: An organism that has a reduced or
Q39: Why are immune responses mediated by antibodies
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