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November 13, 2012

November 13, 2012. Write out the overall reaction of photosynthesis. Announcements. Review of Photosynthesis. At your tables pull out your notes and come up with answers to these questions. What is Photosynthesis? Where does the mass of a plant come from as it grows?

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November 13, 2012

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  1. November 13, 2012 • Write out the overall reaction of photosynthesis

  2. Announcements

  3. Review of Photosynthesis • At your tables pull out your notes and come up with answers to these questions. • What is Photosynthesis? • Where does the mass of a plant come from as it grows? • What are the reactants of Photosynthesis (what goes in)? What are the products (what comes out)?

  4. How does photosynthesis really work? • Plants capture sunlight using light absorbing molecules called pigments. • Chlorophyll: is found in chloroplast, is the principal pigment for capturing sunlight.

  5. Chlorophyll • There are two types of chlorophyll (A and B) and each captures different wave lengths of UV light.

  6. Photosynthesis can be broken up into three steps • Light dependent reactions • Electron Transport Chain • Light independent reactions (Calvin Cycle)

  7. The anatomy of a Chloroplasts • Thylakoids are saclike membranes which contain the chlorophyll. These are arranged in stacks called grana. • This is where the light-dependent reactions occur.

  8. Chloroplast anatomy • The stroma is the region outside the thylakoid membranes. This is where the light-independent reactions take place.

  9. Light-Dependent Reactions • Light-dependent reactions require light to function, and produce three major products. • Oxygen • ATP • NADPH

  10. Products of the Light-dependent reactions • These products are used to conduct the processes in the light-independent reactions. Light-dependent

  11. ATP • ATP is a unit of cellular energy responsible for transferring energy within the cell for metabolism

  12. NADPH • This is an electron carrier used to transfer energy.

  13. Electron Transport Chain • Electron transport chains are the cellular mechanisms used for taking energy from sunlight. • This requires electron Carriers like NADPH

  14. Light-independent Reactions • Light-independent reactions take place in the stroma, outside of the thylakoid membrane • The Calvin Cycle uses ATP NADPH from the previous reactions to produce high-energy sugars.

  15. Calvin Cycle • Begins with six CO2 molecules and ATP to create a six carbon sugar (C6H12O6). Calvin Cycle

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