Vitamin K dependent clotting factors are:: (A) Factor III & XI, (B) Factor IX & X, (C) Factor V & VIII, (D) Factor XI & XIII
Answer is B. Vitamin K is the cofactor for g-carboxylation of glutamate residues of the proteins to produce g carboxy glutamate (gla)- Clotting factors contain 4 to 6 g-carboxyglutamate residues Eg- II VII IX X Protein C Protein S Protein Z Osteocalcin Transthyretin (Prealbumin)