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Vitamin-K is required for
1) change of prothrombin to thrombin
2) synthesis of prothrombin
3) change of fibrinogen to fibrin
4) formation of thromboplastin
The correct answer is synthesis of prothrombin
Prothrombin is a protein that is produced in the liver and is necessary for blood clotting. Vitamin K is required for the synthesis of prothrombin, which means that without enough vitamin K, the body is unable to produce adequate amounts of prothrombin. This can lead to bleeding disorders, such as easy bruising and excessive bleeding.
Vitamin K is also involved in the conversion of other blood clotting factors, such as factors VII, IX, and X, from their inactive forms to their active forms. This conversion is necessary for proper blood clotting.