Sci 230 Cell Energy

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Associate Program Material Cell Energy Worksheet Answer the following questions: Cellular respiration: • What is cellular respiration and what are its three stages? The purpose Cellular respiration is to convert the energy stored in glucose into ATP. Cellular respiration is the process by which cells harvest the energy stored in food that we eat, it is the pathway for the production of adenosine triphosphate (ATP). The three stages of cellular respiration are glycolysis, the citric acid cycle, and electron transport. What is the role of glycolysis? Include the reactants and the products. Where does it occur? Glycolysis is a 6 carbon sugar that serves as the primary energy source in the body. Glucose is split into two molecules called pyruvate and two ATP molecules are generated per molecule of glucose as well as two molecules of NADH. Also Glucose takes place in the cytoplasm of the cell. Glycolysis can occur with or without oxygen. Without oxygen it is called fermentation with oxygen it is the first stage of the cellular respiration. • What is the role of the citric acid cycle? Include the reactants and the products. Where does it occur? The citric acid cycle is the second stage in the cellular respiration. Citric acid occurs in the matrix of the inner membrane of the mitochondrial. Citric acid starts after the glycolysis cycle produces the acetyl CoA compound and passes down two of the pyruvic acid molecules into the citric acid cycle. The acetyl CoA are broken down into carbon dioxide molecules with the formation of the two carbon dioxide molecules per each acetyl CoA, one ATP molecule is also made. • What is the role of the electron transport system? Include the reactants and the products. Where does it occur? Electron transport system is the 3rd stage and

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