So inside plants, we have a variety of different types of enzymes that essentially transform. They harvest or capture the energy that is stored in electromagnetic radiation that comes from the sun, namely light. So they transform the energy that is stored in light into energy stored in the chemical bonds of glucose and sugar molecules. 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.