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Energy in a Cell

Energy in a Cell. Cellular Respiration. Cellular Respiration. Cellular respiration : process where mitochondria break down food molecules to produce ATP . (energy). Cellular Respiration.

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Energy in a Cell

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  1. Energy in a Cell Cellular Respiration

  2. Cellular Respiration • Cellularrespiration: process where mitochondria break down food molecules to produce ATP. (energy)

  3. Cellular Respiration • Three stages in cellular respiration: glycolysis, citric acid cycle, and electron transport chain.

  4. Cellular Respiration • Mitochondria is called the powerhouse of the cell because it is the site of cellular respiration.

  5. Cellular Respiration • More work a cell does, the more mitochondria it has.

  6. Cellular Respiration • Glycolysis: first stage of cellular respiration.

  7. Cellular Respiration • Takes place in the cytoplasm of the cell.

  8. Cellular Respiration • One C6H12O6 (glucose) is brokendown into 2 pyruvic acid molecules. (a 3 C molecule)

  9. Cellular Respiration • For every glucose molecule broken down, 2ATP molecules are produced.

  10. Cellular Respiration • Next, the pyruvic acid moves into the mitochondria.

  11. Cellular Respiration • Citric acid cycle or Kreb’s cycle : Pyruvic acid is broken down in a series of reactions to produce 2CO2 and 1ATP and electrons are passed on to the electron transport chain.

  12. Cellular Respiration • Electrontransportchain: series of proteins where electrons are passed.

  13. Cellular Respiration • Energy is released as electrons are passed from one molecule to the next.

  14. Cellular Respiration • The released energy is used to make ATP.

  15. Overall: • For every glucose that enters cellular respiration 36 ATP are produced.

  16. Cellular Respiration • Cellular respiration can be classified as aerobic: cellular respiration occurs in the presence of O2.

  17. Cellular Respiration • Most efficient form of respiration.

  18. Cellular Respiration • Krebs cycle is aerobic respiration.

  19. Cellular Respiration • Cellular respiration can also be classified as anaerobic: respiration that proceeds in the absence of O2.

  20. Cellular Respiration • Glycolysis is anaerobic respiration.

  21. Cellular Respiration • Not as efficient as aerobic. Only 2ATP formed.

  22. Cellular Respiration • In the absence of O2, pyruvic acid backs up and is eliminated2 ways:

  23. Cellular Respiration • In you and me, pyruvic acid is converted to lacticacid and builds up in the muscles.

  24. Cellular Respiration • In yeast, pyruvic acid converted to CO2 and ethylalcohol. This makes bread rise.

  25. Cellular Respiration • Anaerobic respiration is also called fermentation.

  26. Cellular Respiration • Which molecule has the most stored energy: fat or carbohydrate?

  27. Cellular Respiration • Fat – it has available energy for 51ATP.

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