An enzyme ‘X’ is required for the conversion of fibrinogen to fibrin. ‘X’ is formed due to catalytic action of another enzyme ‘Y’.
‘Y’ in the above statement is
thrombin
thrombokinase
carbonic anhydrase
enterokinase
Prothrombin →Thrombokinase Thrombin
Fibrinogen →ThrombinFibrin
X is thrombin and Y is thrombokinase.