Immune Response in biochemistry
Polysaccharides on the surface of infecting microorganisms can also activate complement directly in the absence of

antibody via metabolic pathway
antigen via the alternative pathway
None of these
antibody via the alternative pathway

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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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