Anti Bodies
Each IgA antibody molecule consists of

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

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Anti Bodies
The immunoglobulin fold is

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

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Anti Bodies
Papain digest IgG into

three Fab fragments and two Fc fragments
three Fab fragments and three Fc fragments
two Fab fragments and two Fc fragments
two Fab fragments and one Fc fragment

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