Mammals Produce Five Major Classes of Immunoglobulins

Short Answer

Mammals produce five major classes of immunoglobulins. Indicate whether each of the following descriptions better applies to the immunoglobulin A, D, E, G, or M class. Your answer would be a five-letter string composed of letters A, D, E, G, and M only, e.g. GMADE.
( ) It binds to cells that secrete histamine.
( ) It is the major antibody in secretions such as saliva.
( ) It is the major antibody circulating in the blood.
( ) It is found on the surface of naïve B cells along with IgM.
( ) It forms wheel-like pentamers involved in the primary immune response.