Now, humans and other animals then eat that glucose, and they themselves use enzymes in the process we're going to discuss eventually the process is glycolysis, Pyruvate decarboxylation, and then the Krebs cycle. So basically, in these processes, we have many different enzymes that essentially catalyze the transformation of the energy stored in the chemical bonds of glucose into the energy that is stored in the proton gradient that exists across the membrane of mitochondria and then the energy stored in that membrane in the electrochemical gradient due to the protons found across the mitochondrial membrane. That energy transformed into energy stored in the bonds of ATP molecules adenosine triphosphates. And we'll discuss that in much more detail eventually. So we see that these enzymes are very, very good at transforming one form of energy that we can't use into a form that we can use, and that is what enzymes do. Number three enzymes typically do not act alone, and they require additional molecules.