Key Takeaways

KEY TAKEAWAYS

• Metabolism basically involves the catabolism of certain organic molecules. • Glycolysis is the first step in breaking down glucose into pyruvate, yielding some

ATP and molecules that can later be used to make more ATP. • There is a transition reaction between glycolysis and the Krebs cycle. • Some organisms proceed from glycolysis to fermentation, which has different end products, depending on the organism. These can be things like lactic acid, acetic acid, and CO2. • The Krebs cycle is cyclic and generates ATP and other molecules that can later be used to make energy. • Most of the ATP is gotten through oxidative phosphorylation and the electron transport chain. • Energy is stored by transferring hydrogen ions across a membrane in a cell, which goes on to drive the synthesis of ATP. • Photosynthesis involves two phases of reactions that capture light to make organic molecules. • The biogeochemical cycles will involve the movement of molecules into different forms and in different aspects of the environment.