Question

IgM

A) most common type of antibody in the blood during the initial phase of an immune response
B) produced by virally infected cells
C) complement activation
D) substances used to signal between leukocytes
E) chemotaxis of leukocytes

Answer 1

IgM is the most common type of antibody in the blood during the initial phase of an immune response. It is initially produced in a monomeric form and then assembles into a pentamer. IgM is the first antibody made by B cells and helps clear pathogens from the blood.

Step-by-step explanation:

IgM is the most common type of antibody in the blood during the initial phase of an immune response. It is the first antibody produced and secreted by B cells during the primary and secondary immune responses. IgM is initially produced in a monomeric form and then assembles into a pentamer with five monomers of IgM bound together. The pentamer arrangement allows IgM to bind to ten identical antigens and clear pathogens from the blood. However, IgM does not bind to antigens as stably as IgG, which is the main antibody of late primary and early secondary responses in the blood.