Anti Bodies
Antigenic determinants bind to which portions of an antibody?

Only heavy chains
Constant regions
Variable regions
Only light chains

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

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