During blood transfusion, it is recommcnded to transfer only the blood of the corresponding group. In ABO system the blood group is dotermincd by

Answer options

1. Carbohydrate determinants of leukocyte membranes
2. Protcin determinants of erythrocyte membranes
3. Blood serum protcins
4. Carbohydrate deteminants of erythrocyte membranes
5. Protein-polysaccharide components of leukocytes