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Photosynthesis vs. Respiration

Photosynthesis vs. Respiration. Energy Changes:. Glucose (C 6 H 12 O 6 ) + Oxygen (6 O 2 ). Energy. Energy. Energy. 36 ATP. Respiration. Photosynthesis. 6 CO 2 + 6 H 2 O. 6 CO 2 + 6 H 2 O. Amount of energy stored in chemical bonds. Photosynthetic cells carry on both processes’

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Photosynthesis vs. Respiration

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  1. Photosynthesis vs. Respiration Energy Changes: Glucose (C6H12O6) + Oxygen (6 O2) Energy Energy Energy 36 ATP Respiration Photosynthesis 6 CO2 + 6 H2O 6 CO2 + 6 H2O Amount of energy stored in chemical bonds Photosynthetic cells carry on both processes’ Some eukaryotic cells All Eukarytoic cells carry on respiration(animal cells)

  2. Cellular Respiration – Releasing Chemical Energy 2 Steps in releasing energy from glucose: - Glycolysis - Respiration (or Fermentation)

  3. Glycolysis Glucose 2 ATP Energy Pyruvic Acid Pyruvic Acid

  4. Citric Acid Cycle (Krebs Cycle) Energy Cristae 34 ATP ADP Pyruvic Acid Electron Transport Chain e- + H+ + ½ O2 = CO2 H2O CO2 Acetyl Group Acetyl CoA Coenzyme A FAD FADH2 NAD+ NADH Acetyl Group e- Citric Acid Cycle Matrix CO2

  5. Respiration C6H12O6 glucose + 6O2 oxygen → 6CO2 Carbon dioxide + 6H2O water + ENERGY (ATP and Heat)

  6. Chloroplast NADPHH+ C6H12O6 Simple Sugar Containing stored Chemical energy Light Reactions Dark Reactions ATP 6H20 6O2 CO2 Electron Transport Chain Glycolysis Citric Acid Cycle Cytoplasm Mitochondrion ~36ATP

  7. Review - Photosynthesis Goal: To trap UV energy into chemical energy = GLUCOSE Location: Chloroplast in photosynthetic cells Steps: 1) Light is absorbed within the photosynthetic membranes (chlorophyll of photosystem I and photosystem II.) Water is split 2) High energy electrons produced through the absorption of UV light are passed down an electron transport chain. 3) As energy is lost from electrons, NADPH and ATP are produced through the conversion of energy into chemical bonds in those molecules. 4) ATP and NADPH are used in the CALVIN CYCLE to convert CO2 to glucose (1 carbon compound into a 6 carbon compound)

  8. Respiration Goal: To convert chemical (food) energy into small packages so that usage can be efficient and least amount possible is lost as heat Location: Mitochondriain all eukaryotic cells Steps: 1) Glucose is broken down into pyruvic acid (3 carbon compound) outside of the mitochondrial membrane…without oxygen…ANEROBIC PROCESS. Pyruvic Acid converts to an acetyl group (2 carbon compound). 2) Acetyl group gets picked up by Coenzyme A and is transported to the Krebs Cycle 3) The cycle pulls apart high energy bonds left after glycolysis and releases electrons. 4) High energy electrons are delivered to the ELECTRON TRANSPORT CHAIN. Their energy is reduced to produce ATP. 5) Energy depleted electrons combine with oxygen and hydrogen to form water.

  9. Summary Glucose 2 ATP Glycolysis Pyruvic Acid Grand Total: 36 ATP 2 ATP Krebs Cycle Electron Transport Chain 32 ATP

  10. Anaerobic Cycles When you are out of oxygen you resort to anaerobic cycles Glucose Pyruvic Acid Lactic Acid Fermentation Alcoholic Fermentation 2 molecules of ATP Lactic Acid Ex. Muscle cells 2 molecules of ATP Carbon Dioxide Ex. Yeast, microorganisms

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