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Understanding Cellular Respiration Process: Glycolysis, Krebs Cycle & Electron Transport

Learn the two main stages of cellular respiration - Glycolysis and the Krebs cycle, followed by the Electron Transport Chain. Discover how energy-carrying molecules are produced and how ATP is generated in this aerobic process.

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Understanding Cellular Respiration Process: Glycolysis, Krebs Cycle & Electron Transport

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  1. KEY CONCEPT Cellular respiration is an aerobic process with two main stages.

  2. Glycolysis is needed for cellular respiration. • The products of glycolysis enter cellular respiration when oxygen is available. • two ATP molecules are used to split glucose • four ATP molecules are produced • two molecules of NADH produced • two molecules of pyruvate produced

  3. The Krebs cycle is the first main part of cellular respiration. • Pyruvate is broken down before the Krebs cycle. • carbon dioxide released • NADH produced • coenzyme A (CoA) bonds to two-carbon molecule

  4. The Krebs cycle produces energy-carrying molecules.

  5. The Krebs cycle produces energy-carrying molecules. • NADH and FADH2 are made • intermediate molecule withCoA enters Krebs cycle • citric acid(six-carbon molecule)is formed • citric acid is broken down,carbon dioxide is released,and NADH is made • five-carbon molecule is broken down, carbon dioxide is released, NADH and ATP are made • four-carbon molecule is rearranged

  6. The electron transport chain is the second main part of cellular respiration. • The electron transport chain uses NADH and FADH2 to make ATP. • high-energy electrons enter electron transport chain • energy is used to transport hydrogen ions across the inner membrane • hydrogen ionsflow through achannel in themembrane

  7. The electron transport chain is the second main part of cellular respiration. • The breakdown of one glucose molecule produces up to38 molecules of ATP. • The electron transport chain uses NADH and FADH2 to make ATP. • ATP synthase produces ATP • oxygen picks up electrons and hydrogen ions • water is released as a waste product

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