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Biochemistry miscellaneous c50a21ad

True about IgM

A
Fix Complement
B
Increased in primary response
C
Fab region is composed of variable region
D
Fc is antibody - binding option
High-Yield Explanation
IgM Produced in the primary response to an antigen Fixes complement.Does not cross the placentaAntigen receptors are on the surface of B cells.IgG is also involved in complement fixationReference: Harper biochemistry 30th edition page no 681

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