What molecule is required for the proper production of prothrombin?
A) factor Xa
B) factor Va
C) tissue factor
D) fibrin
E) vitamin K

Question

Quizplus · Accepted Answer

Vitamin K is essential for the synthesis of prothrombin and other clotting factors (II, VII, IX, and X) in the liver. It acts as a cofactor for the carboxylation of glutamic acid residues on these proteins, which is necessary for their proper function in the coagulation cascade.

What Molecule Is Required for the Proper Production of Prothrombin