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6-1 Notes: Light Reactions

6-1 Notes: Light Reactions.  6CO 2 + 6H 2 O → →→→→C 6 H 12 O 6 (sugar)+ 6O 2. Light Reaction. First stage of photosynthesis Main point: Absorb light energy and water Converted to chemical energy ATP and NADPH Produces oxygen. What to do?. ONLY write words in BLACK!!.

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6-1 Notes: Light Reactions

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  1. 6-1 Notes: Light Reactions

  2.  6CO2 + 6H2O → →→→→C6H12O6 (sugar)+ 6O2

  3. Light Reaction • First stage of photosynthesis • Main point: • Absorb light energy and water • Converted to chemical energy ATP and NADPH • Produces oxygen

  4. What to do? • ONLY write words in BLACK!!

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

  6. 1. Chlorophyll a – Pigment that absorbs light energy, some blues and lots of reds. Located in Photosystems in thylakoid membrane Chloroplast are green because they don’t absorb green!

  7. 2. Chlorophyll b Absorbs lots of blues and some reds 3. Carotenoids Three pigments (Orange, Brown, and Yellow) that focus on absorbing blues and greens These colors are seen in the fall and in vegetables

  8. Light reactions begin by Chlorophyll absorbing light. Flattened sacs within the chloroplast. Stacks of thylakoids are called grana. The liquid area surrounding the thylakoids inside the chloroplast.

  9. Step 1: Absorb Light • Protein full of pigments (chlorophyll a) • Located in the thylakoid membrane. • Two photosystems exist: Photosystem I and Photosystem II.

  10. Step 2: Move e- down electron transport chain Light excites e- from photosystem II & I and sends them down the electron transport chain (ETC)

  11. Step 2: Move e- down electron transport chain This moves Protons (H+) into the thylakoid This 1st part of the Light reactions is all about creating a concentration gradient (High H+ in the thylakoid – Low H+ outside)

  12. Step 3: Chemiosmosis • H+ pass through enzyme (ATP Synthase) spinning it. • This powers the conversion of ADP to ATP (which will be used in the Calvin Cycle)

  13. Replacing the Electron in Photosystems I and II Water splits which donates electrons needed to refresh photosystem II. This Creates Oxygen gas which diffuses out of cell

  14. Summary ReactantsProducts • Chlorophyll absorbs light • Electrons move down the ETC pulling H+ into thylakoid 3. Protons (H+) move through enzyme at end of ETC spinning it converting ADP to ATP 4. E- are replaced by the splitting of H2O • This creates O2 gas

  15. Create and fill in this chart in your Notes Sunlight H2O (Water) O2 (oxygen) ATP Thylakoid

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