In this reaction, all reactants and products are invisible. The heat being evolved is the clue that tells you a reaction is taking place. This is a good example of an exothermic reaction, a reaction in which heat is given off. A lot of reactions are exothermic.
Prothrombinase will cleave prothrombin to make thrombin and thrombin is the enzyme that cuts fibrinogen to make fibrin for clot formation [Blood Clotting: The Basics]. The platelet prothrombinase activity is the same as the activity on TP-bearing cells: itâs formed from Xa and membrane-bound Va.
The sequences at -10 and -35 are recognized and bound by the RNA polymerase before transcription can begin. How does RNA polymerase bind and carry out transcription in prokaryotes? Prokaryotic RNA polymerases have 2 components, a core enzyme and a sigma factor (a.ka. sigma subunit).