For each of the types of immunoglobulin listed on the left select the most appropriate association from those on the right

The answer is E, D, A. Following injection of antigen into an animal not previously exposed to that antigen there is a transient appearance in the blood of a small quantity of specific IgM class antibody in about 7 days (primary antibody response); re-injection of the antigen at a later date results in production of IgG class antibody in large amounts within 4 days (secondary antibody response).

IgA is secreted by plasma cells as a dimer, i.e., 2 molecules linked together by a polypeptide, J-chain. IgM is also produced as a pentamer, the 5 IgM molecules being linked by 1 J-chain and 4 disulphide bonds.

Mast cell degranulation (C) is a property of IgE.

Lymphocyte surface antigen receptor (B) is a property of IgD.