The followings are applicable for IgM
A
First immunoglobulin (Iappeared on B cell surface
B
Remain monomeric form on B cell surface
C
Can fix complement
D
Principal Ig in secondary immune response
E
Highest concentration in serum
Correct Answer: First immunoglobulin (Iappeared on B cell surface, Remain monomeric form on B cell surface, Can fix complement