Biochemistry General f2c8ffea Carboxylation of clotting factors by vitamin K isrequired to be biologically active. Which of the following amino acid is carboxylated? A Histidine B Histamine C Glutamate D Aspaate High-Yield Explanation Glutamate [Ref: Harper 26/e p486/ See explanation of q no. 34 of Nov 2007.