Anti Bodies
A polyclonal antibody response

is produced by several B cells recognizing different pitopes on the same antigen
is produced only in response to polymeric antigens
violates clonal selection
occurs during the lag phase of the immune response

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Anti Bodies
Each IgA antibody molecule consists of

two polypeptide chain and has two antigen binding site
three polypeptide chain and has two antigen binding site
two polypeptide chain and has one antigen binding site
four polypeptide chain and has two antigen binding site

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Anti Bodies
The immunoglobulin fold is

a β-barrel composed of a three- and a four-stranded antiparallel β-sheet
both (a) and (b)
found only in IgG molecules
found six times in the IgG molecule

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