All of the following are true of IgM antibodies, EXCEPT which one?
A) They fix complement.
B) They occur on the surface of B-lymphocytes.
C) They predominate in the primary immune response to antigen.
D) They are glycoproteins.
E) They are a molecule with a single, defined amino acid sequence.

Question

Quizplus · Accepted Answer

IgM antibodies are not molecules with a single, defined amino acid sequence. Instead, they are composed of five monomeric units, each with its own variable and constant regions, allowing for a diverse range of antigen binding. This structure enables them to be effective in the primary immune response.

All of the Following Are True of IgM Antibodies, EXCEPT