Question

The molecular mass of IgG is 150 kDa, and that of the antigen-antibody complex formed in the presence of
large excess of antigen is 300 kDa. The molecular mass of the antigen is
a. 25 kDa
b. 50 kDa
c. 75 kDa
d. 150 kDa
[IISc]
pls explain answer
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Answer 1

gG antibodies are large molecules, having a molecular weight of approximately 150 kDa, composed of two different kinds of polypeptide chain. One, of approximately 50 kDa, is termed the heavy or H chain, and the other, of 25 kDa, is termed the light or L chain..