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Cellular Respiration

Explore the process of cellular respiration and how cells convert chemical energy from carbohydrates into ATP. Learn about the inputs and outputs of cell respiration, and discover the relationship between cellular respiration and photosynthesis.

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Cellular Respiration

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  1. Cellular Respiration Converting Chemical Energy from Carbohydrates into Chemical Energy of ATP

  2. Cellular Respiration (Aerobic ) • How do cells transform matter and energy? • What are the major inputs and outputs of cell respiration? • What is the relationship between cell respiration and study photosynthesis?

  3. Cellular Respiration and Photosynthesis • These are ‘opposite’ processes • The products of photosynthesis are the reactants of respiration and vice versa. • Energy stored through photosynthesis is released through cellular respiration

  4. Cellular Respiration and Photosynthesis • Photosynthesis stores small packets of energy in a larger packet. • Like turning in one hundred $1 bills to get a $100 bill • Cell Respiration takes a lot of energy and breaks it into smaller packets. • Like turning in a $100 bill and getting five $20 bills.

  5. Cellular Respiration Overview In the mitochondria of living things, oxygen helps the break- down of sugars (glucose) to release energy useable by the cell (ATP) Products and Reactants (1) C6H12O6 + (6) O2 (6) CO2 + (6) H2O + ATP

  6. Cellular Respiration Overview • Glycolysis is the anaerobic process of breaking down glucose to generate ATP • Krebs Cycle and Electron Transport require oxygen to further break down carbon molecules to generate ATP O2 Pyruvic acid Mitochondria Glucose H+ Electron Transport Chain Glycolysis Krebs Cycle CO2 H2O 2 36

  7. Glycolysis • Glucose (6 carbon sugar) breaks down into pyruvate (3 carbon molecules ) and ATP (energy) • Similar to reversing the final stage of photosynthesis when two 3-carbon sugars were used to make glucose

  8. Krebs Cycle • Pyruvate (3 carbon) breaks down into carbon dioxide (1 carbon) and electrons are used to generate ATP (energy) • Similar - in reverse - to the Calvin cycle in photosynthesis

  9. Electron Transport Chain • Electrons generated during glycolysis and Kreb’s cycle are used to generate ATP • At the end they come together with oxygen to form water • Again, similar, but in reverse of the electron transport chain in the light dependent reactions of photosynthesis Electron Transport Chain

  10. Energy Transformed - Cell Respiration • 36 ATP units are released from one glucose unit • A unit of glucose molecules contains 686 kcal of stored energy. A unit of ATP stores 7.5 kcal. • How efficient is the transformation from energy stored in glucose to energy released as ATP?

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