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

Variable regions
Constant regions
Only heavy chains
Only light chains

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

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