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Cellular respiration is the process through which cells convert sugars into energy. To create ATP and other forms of energy to power cellular reactions, cells require fuel and an electron acceptor which drives the chemical process of turning energy into a useable form.
1) Glycolysis. In the first step of cellular respiration, glycolysis, a glucose molecule undergoes a series of chemical transformations in the cytosol of all living cells. It is the only step that is shared by all types of respiration. As this step does not use oxygen, it is considered anaerobic.
Cellular respiration is a metabolic process consisting of a series of steps to convert chemical energy (sugar) into a usable form of energy (ATP) in the cell.
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The process occurs in two phases: glycolysis, the breakdown of glucose to pyruvic acid. the complete oxidation of pyruvic acid to carbon dioxide and water. In eukaryotes, glycolysis occurs in the cytosol and the remaining processes take place in mitochondria.
The overall process, however, can be distilled into three main metabolic stages or steps: glycolysis, the tricarboxylic acid cycle (TCA cycle), and oxidative phosphorylation (respiratory-chain phosphorylation).
Cellular respiration is a collection of three unique metabolic pathways: glycolysis, the citric acid cycle, and the electron transport chain. Glycolysis is an anaerobic process, while the other two pathways are aerobic.