<prompt> Vitamin K is a cofactor inCarboxylationHydroxylationDeaminatiomHydrolysis  <response>: Refer Katzung 10e p 549 Vitamin K is involved in activition if various clotting factors as well as anticlotting clotting proteins It carries out the final step in activation of these ors I. E, gamma carboxylation of glutamate residues in these factors 