Microbiology Which immunoglobulin has no known function but is present on the surface of B lymphocytes and it may function as an antigen receptor? A IgA B IgE C Ig D D IgM 💡 Explanation Which immunoglobulin has no known function but is present on the surface of B lymphocytes and it may function as an antigen receptor? ✓ Correct Answer: C. Ig D