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.
In prokaryotes, RNA polymerase is the helicase that unzips the dsDNA for transcription. In eukaryotes, transcription factor II H (TFII H) is the helicase that unzips the dsDNA.TFII H also functions as a kinase.ith the primer in place, DNA polymerase catalyzes the synthesis of a new strand of DNA. The new nucleotides align themselves with the old DNA. These strands grow from the 5'--3' direction.