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Answer: C 75 KDa Explanation: The molecular mass of IgG being 150 KDa and that of antigen-antibody complex 300 KDa. Therefore if we want to find out the molecular mass of antigen then, = Molecular mass of antigen antibody complex - molecular mass of IgG = 300-150 = 150 KDa One antibody has two antigen binding sites, hence 150/2 = 75 KDa
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