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Photosynthesis

Photosynthesis. Chapter 6 pg. 116-124. The Light Reactions. Steps: Light absorption  Electron Transport Chain  Chemiosmosis. Light Reaction . Location: Thylakoid Membrane Reactants: Light and H2O Product: O2 (waste product) and ATP. Calvin Cycle. Location: Stroma

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Photosynthesis

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  1. Photosynthesis Chapter 6 pg. 116-124

  2. The Light Reactions • Steps: • Light absorption  Electron Transport Chain  Chemiosmosis

  3. Light Reaction • Location: Thylakoid Membrane • Reactants: Light and H2O • Product: O2 (waste product) and ATP

  4. Calvin Cycle • Location: Stroma • Reactants: CO2 and ATP • Product: C6H12O6 (sugar)

  5. Light and Pigments • Light • Visible light includes the colors of the rainbow • Pigments • Compounds that absorb specific colors of light. Absorbed colors are not visible.

  6. Visible Light Spectrum The color you see is what the object DOES NOT absorb (reflected)

  7. Chlorophyll a – Pigment that absorbs light energy • Absorbs reds and blues • Located in thylakoid membrane. Chloroplast are green because they don’t absorb green!

  8. 2. Carotenoids • Three pigments (Orange, Brown, and Yellow) that focus on absorbing blues and greens These colors are seen in the fall and in vegetables

  9. Calvin Cycle • Location: Stroma • Reactants: CO2 and ATP • Product: C6H12O6 (sugar)

  10. PHOTOSYNTHESIS OCCURS IN TWO PARTS SUMMARY LIGHT REACTIONS: Make energy in the form of ATP and e- carrier CALVIN CYCLE: Uses the ATP and e- carrier to make carbohydrates 1. Light absorption (by plant pigments) 2. Electron transport chain (making e- carrier) 3. Chemiosmosis (making ATP) 4. Calvin Cycle (making carbohydrates from CO2)

  11. Rate of photosynthesis • Photosynthesis is affected by the environment: • Light and Temperature • The rate of photosynthesis increases as light intensity increases. • Limited to a maximum rate once all available electrons are excited. • The rate of photosynthesis increases as temperature increases, over a certain range. • Rate peaks when the enzymes begin to become ineffective with increased temperature.

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