IgG does not cause precipitation.

IgG is the most abundant antibody in the human body. 

IgG is used to neutralise snake and scorpion venom.

IgM is the first antibody to appear in response to initial exposure to an antigen.

IgG can pass through placenta and confer passive resistance to the foetus.

IgM and IgA both have agglutination activity.

IgG and IgM activate complement.

IgD is a membrane bound immunoglobulin, because of which there is lesser concentration of IgD in serum.

In mucosal system, IgA exists as a dimer.

The half life of IgE immunoglobulins increases to 2 weeks if IgE molecules bind to mast cells.

Teleost IgM is a tetrameric molecule.

IgE antibody is effective against parasitic infections.

x-Linked agammaglobulinemia is a rare X-linked genetic disorder which manifests as a complete lack of antibodies in bloodstream.

The spleen where plasmablasts responsible for antibody production reside is the major site of specific IgM production.

IgE level increases in rheumatoid arthritis.

All birds have IgY antibody.

Antibodies are glycoproteins.

The Fc region of antibody which gives the ability to an antibody to communicate with the other components of the immune system contains conserved glycosylation site.

The part of antibody which recognises an antigen is called paratope. It is a small portion of variable region of antibody that contains both heavy and light chains

This is the correct match.

IgG+ isotype is expressed on the surface of immature B-cells.

This is the correct match.