Laboratory isolation of an anti-Streptococcus antibody was found to bind to ten Streptococcus pyogenes at one time. The antibody isolated was
A) IgG.
B) IgM.
C) IgA.
D) IgD.
E) IgE.

Question

Quizplus · Accepted Answer

IgM is a pentameric antibody that has 10 binding sites, allowing it to bind to 10 antigens at once. IgG, IgA, IgD, and IgE are monomeric antibodies with only one binding site per molecule.

Laboratory Isolation of an Anti-Streptococcus Antibody Was Found to Bind