What is prothrombin?

A. an inactive protein needed for blood clot formation
B. a storage protein for vitamin K
C. a soluble protein that decreases the "stickiness" of red blood cells
D. a transport protein for vitamin E
E. an active protein needed for bone formation



Answer :

Final answer:

Prothrombin is an inactive protein necessary for blood clot formation, dependent on vitamin K synthesis.


Explanation:

Prothrombin is an inactive protein needed for blood clot formation. It is a precursor of thrombin, which converts fibrinogen into fibrin, essential for clotting. Vitamin K is crucial for the synthesis of prothrombin.


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