Blood group antigen NAG transferase present but galactosyl transferase is absent is ?: (A) Group A, (B) Group B, (C) Group AB, (D) Group 0
Answer is A. Ans. is'a'i.e., Group AABO gene products are the products of enzymatic reactions, catalysed by enzymes called glycosyltransferase (galactosyltransferase).