Question

multiple choice question
the enzyme ______ converts fibrinogen into fibrin.

○ thrombin
○ calcium
○ prothrombin
○ fibrin

Explanation:

In the process of blood clotting, thrombin is the enzyme that catalyzes the conversion of fibrinogen (a soluble plasma protein) into fibrin (insoluble threads that form the clot). Calcium is an ion involved in the clotting cascade but not the enzyme here. Prothrombin is a precursor that is converted to thrombin. Fibrin is the product, not the enzyme.

Answer:

A. thrombin