Anti Bodies
Each IgA antibody molecule consists of

three 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
four polypeptide chain and has two antigen binding site

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Anti Bodies
The immunoglobulin fold is

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

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Anti Bodies
Type A blood

can be used to donate to type AB individuals
contains type B antigens on the surface of red blood cells
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 main function of antibodies is to

chemically combine with the antigen which induces it, inactivate the antigen and protect the body from disease
generate antigens, thus conferring immunization
protect the circulatory system
kill all the foreign bodies

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