Antibody
Which is not a function of IgA?

Agglutinate antigen
Fix complement
Protect eyes
Protect mucosal surfaces

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Antibody
Which is not a function of IgG?

Activates or fixes complement
First antibody type produced against an antigen during the primary antibody response
Major antibody in serum
Involved in opsonization

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Antibody
Self reactive antibodies are not found in significant concentration in normal serum because

it is impossible to generate a self-reactive antibody
B cells that are stimulated via their surface bound antibody in the absence of T cell help to commit suicide
self reactive B cells switch to IgA which is all secreted and not present in serum
self reactive B cells are killed by CD8 T cells

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Antibody
The secretary component of sIgA is

formed by cleavage of an epithelial cell receptor used to transport the dimeric IgA across the epithelial cell
added to dimeric IgA by the M cell
made by T cells
made by plasma cells that secrete dimeric IgA

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