The Fc piece of which immunoglobulin fixes complement 1 -
Ans. is 'c' > 'b' i.e., IgM > IgG o Make it very clear in your mind that both IgM and IgG fix C1." CH2 of IgG and CH4 of IgM bind to C1q portion of C1"-------Ananthanarayan" Clq portion of Cl is an aggregate of 18 polypeptides that binds to the Fc portion of IgM and IgG"--LANGE microbiologyo However, if you will have to choose one option, IgM is the best because IgM is more effective than IgG for complement fixation.
Anitibody
IgA
IgG
IgM
IgE
IgM