The natural antibodies in serum that react with A or B polysaccharide antigens are mostly of the class
A) IgG.
B) IgE.
C) IgM.
D) IgD.
E) IgA.

Question

Quizplus · Accepted Answer

The natural antibodies that react with A or B polysaccharide antigens are mostly of the class IgM. These antibodies are produced by B cells without prior exposure to the corresponding antigen, as they are part of the innate immune system. They provide immediate protection against the antigens until a specific immune response can be developed. IgG antibodies are produced later during an immune response, usually after exposure to the antigen, and are more specific. IgE, IgD, and IgA do not play a significant role in the natural antibodies that react with A or B polysaccharide antigens.

The Natural Antibodies in Serum That React with a or B