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A: Cells use energy in order to grow, regulate metabolism and reproduce. This energy is obtained from a source such as food molecules or light from the sun, and through processes like glycolysis, the citric acid cycle and oxidative phosphorylation, an energy-rich molecule is then created.
Mitochondria are called the power plants of the cell because they use energy from organic compounds to make ATP (adenosine triphosphate). ATP is the cell's energy source that is used for such things such as movement and cell division. cristae: Inner membrane folds of the mitochondrion. 2  matrix: Fluid-filled inside of the mitochondrion. 3  mitochondria (singular, mitochondrion): Organelle in eukaryotic cells that makes energy available to the cell in the form of ATP molecules.