Anti Bodies
Each IgA antibody molecule consists of

three polypeptide chain and has two antigen binding site
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

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Anti Bodies
Type A blood

contains type B antigens on the surface of red blood cells
can be used to donate to type AB individuals
can be used to donate to type B individuals
can always be used to donate to an Rh+ individual

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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
IgE provides

secretions in the body
All of these
immunity against some parasites
complement killings of the cells and phagocytosis

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