Which antibody has two antigen-binding sites?
A) IgM
B) IgA
C) IgG
D) Both A and B

Question

Quizplus · Accepted Answer

IgG has two antigen-binding sites, allowing it to bind to two antigens simultaneously. IgM and IgA also have multiple binding sites, but IgM has ten and IgA can have either two or four, depending on the specific form of the antibody. Therefore, C is the best choice because it specifically matches the description of an antibody with two antigen-binding sites.

Which Antibody Has Two Antigen-Binding Sites