Question

Which is the first antibody to be produced in primary response?

• A. IgM
• B. IgG
• C. Both IgG and IgM are involved in primary response
• D. IgG is involved in secondary immune response

Answer 1

The correct option is A

IgM

IgM is the first antibody produced in primary immune response. IgM has five antigen binding sites and hence, IgM can bind more antigen molecules. Hence, it can swiftly neutralise more antigens initially. IgG is also secreted but in much lesser amounts and also later than IgM.