What is the percentage of immunoglobulins present in proteins: (A) 5-10%, (B) 10-15%, (C) 15-20%, (D) 20-25%
Answer is C. Immunoglobulins constitute 20 to 25% of total serum proteins. Based on physiochemical and antigenic differences, five classes of immunoglobulins have been recognized: IgG, IgA, IgM, IgD, and IgE.(Ref: Ananthanarayan 9th edition, p93)