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How Cells Obtain Energy from Food. As we have just seen, cells require a constant supply of energy to generate and maintain the biological order that keeps them alive. This energy is derived from the chemical bond energy in food molecules, which thereby serve as fuel for cells.
Cells generate energy from the controlled breakdown of food molecules. Learn more about the energy-generating processes of glycolysis, the citric acid cycle, and oxidative phosphorylation.
Organisms get energy from food via catabolic pathways. These pathways break down biomolecules such as carbohydrates and lipids. Catabolic pathways are exothermic processes, so they result in an overall release of energy. Organisms use this energy to power cellular processes.
Two opposing streams of chemical reactions occur in cells: (1) the catabolic pathways break down foodstuffs into smaller molecules, thereby generating both a useful form of energy for the cell and some of the small molecules that the cell needs as building blocks, and (2) the anabolic, or biosynthetic, pathways use the energy harnessed by ...
Cells perform the functions of life through various chemical reactions. A cell’s metabolism refers to the combination of chemical reactions that take place within it. Catabolic reactions break down complex chemicals into simpler ones and are associated with energy release.
How Cells Harvest Energy from Food. Chapter-at-a-Glance. An Overview of Cellular Respiration. 8.1 Where Is the Energy in Food? In mitochondria, electrons are stripped from organic molecules to produce NADH and ATP, the reverse of the photosynthesis process in chloroplasts. This occurs in two stages, glycolysis and oxidation.
HOW CELLS OBTAIN ENERGY FROM FOOD. The constant supply of energy that cells need to generate and maintain the bio-logical order that keeps them alive comes from the chemical bond energy in food molecules, which thereby serve as fuel for cells.
