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Photosynthesis

Photosynthesis. Do Now: Complete the diagram below & balance the reaction. Just know it. Commit the balanced photosynthesis reaction to memory. The Basics. Chlorophylls and other pigments are chemicals that absorb light energy in phototrophs . Chloroplasts.

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Photosynthesis

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  1. Photosynthesis Do Now: Complete the diagram below & balance the reaction

  2. Just know it. • Commit the balanced photosynthesis reaction to memory.

  3. The Basics • Chlorophylls and other pigments are chemicals that absorb light energy in phototrophs.

  4. Chloroplasts • In most eukaryotes, organelles called chloroplasts are where photosynthesis happens

  5. There’s more than 1 way to split a water molecule • The details of photosynthesis vary between groups of organisms. • The photosynthetic processes we will study in most detail is that of green plants, because they are most important to human activity. • As usual, bacteria do some crazy biochemistry!

  6. A 2-step Process • The light-dependent reactions capture light energy and supply it to the light-independent reactions, which build carbohydrates

  7. Light-Dependent Reactions • Water is split by light energy • Water is the electron donor for photosynthesis in green plants

  8. Electron Transport • The electrons then flow from a high energy state to lower ones in a series of steps. • That flow of electrons provides the energy to make ATP

  9. Light-Independent Reactions • The Calvin Cycle is the light-independent (or “dark”) reaction of green plants. • Carbon fixation, which is the conversion of inorganic carbon into organic carbon, is its function.

  10. Who Cares? • http://www.youtube.com/watch?v=4DRIg-K6kZs&feature=player_embedded • The future is green.

  11. Recap • Photosynthesis provides almost all of the energy to all living things on Earth. • Sounds important.

  12. Related Reading • “Where do the Atoms Go in Photosynthesis” • pp. 143-145 • There is no written assignment, but you are expected to read.

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