At some point, reactions will reach equilibrium. By using catalysts which speed up reactions by reducing the activation energy. In general, these are the attributes of catalysts. They speed up the rate of a reaction They cannot cause an unfavorable reaction to occur. They won t change the equilibrium Catalysts are not consumed.
Enzymes are very specific.
The turnover number is the number of molecules of substrate that 1 enzyme molecule can work on in 1 second. Frequently, enzymes are attached to membranes, ensuring that they will be in the proper location to perform their function. This brings us back to the big picture the cell structure and where important molecules are located. Now we can revisit the structure of the cell membrane and get a better understanding of where these reactions are taking place. On the extracellular side, the membrane is attached to matrix proteins which help hold adjacent cells together.