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Cellular Respiration

Learn about cellular respiration, the process that converts the chemical energy in carbohydrates into ATP. Discover the locations, reactants, and products of aerobic respiration, as well as the role of anaerobic respiration. Find out why ATP is essential for cells and how many molecules of ATP are generated from the breakdown of one glucose molecule.

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Cellular Respiration

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  1. Cellular Respiration Converting Chemical Energy in Carbohydrates into Chemical Energy in ATP The energy transformations that sustain populations: Respiration Sun--> Photosynthesis -->

  2. I. Aerobic Respiration Location - Cell The reactions of aerobic respiration occur in the mitochondria (organelle/ structure within the cell). B. Products & Reactants of Aerobic Respiration -

  3. C. Overview of Aerobic Respiration - In the mitochondria of living things, oxygen helps to break down sugars (glucose) to release energy, in a form that is useable by the cell (ATP) O2 Pyruvic acid Mitochondria H+ Glucose Electron Transport Chain Krebs Cycle Glycolysis Holds 3811 calories per gram H2O CO2 2 342 Q: Why doesn’t the cell directly use the energy stored in the chemical bonds of sugars? Why does it have to be converted to ATP first?

  4. D. A Closer Look at Aerobic Respiration (Reactants and Products) 1. Glycolysis • glucose (6 carbon sugar) breaks down into pyruvate (3 carbon) molecules and ATP (energy) 2. Kreb’s Cycle • pyruvate breaks down into carbon dioxide (1 carbon) and ATP (energy) 3. Electron Transport Chain and ATP formation • electrons generated during glycolysis and Kreb’s cycle together with oxygen, generate water and energy (ATP) II. Anaerobic Respiration: The breakdown of glucose when oxygen is NOT present. Only produces 2 ATP and lactic acid (resulting in sore muscles).

  5. Q: How many molecules of ATP are generated from the breakdown of one glucose molecule during aerobic cellular respiration?

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