How do cells acquire food energy?

Cells aquire food energy through a process called cellular respiration. This can be aerobic (with Oxygen as the final electron acceptor) or anaerobic (with some other organic molecule like pyruvate as the final electron acceptor). Aerobic respiration can be further broken down into the steps of 1. Glycolysis 2. Pyruvate Oxidation 3. Krebs Cycle 4. Electron Transport Chain It can also take place as photosynthesis but that is a slightly different mechanism Anaerobic Respiration can take place where there is no oxygen available(such as insidee muscles). This is called fermentation(yes the same kind we have to thank for alcohol...God bless anaerobic bacteria).