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Photosynthesis Biology 121 Elena Bernick, Ph.D.

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  • 1. Biology 121 Elena Bernick, Ph.D.

2. Autotrophs are capable of making their own carbohydrates for food Heterotrophs cannot make their own carbohydrates for food and must get them from someone else 3. A process by which light energy is converted to chemical energy in the form of sugar Performed by photoautotrophs Occurs in the chloroplast 4. The organelle where photosynthesis occurs 5. Chlorophyll A Light absorption spectrum, chlor A and chlor B The pigment responsible for absorbing the sunlight which drives photosynthesis Two forms, A and B Found in the chloroplast 6. 6CO2 + 12 H2O + light energy C6H12O6 + 6O2 + 6H2O Relies on the excitation and transfer of electrons Occurs in 2 major stages: the light reactions and dark reactions 7. Produced by the chemical reactions during the light reactions Capable of giving off LOTS of energy! Significant in producing large molecules like glucose 8. Light energy is captured Generates excited electrons Excited electrons captured by NADPH NADPH 9. An excited electron carrier Carries excited electrons from the thylakoid membrane (where they are produced) to the stroma (where they are used to make sugar) 10. PS2 PS1ATP made here!!! NADPH made here!!!!!! Photosystems: light energy collectors. This light energy is used to make ATP and excited electrons 11. Electron transport chains: pull energy from excited electrons and use it to make large molecules. 12. PS2 PS1ATP made here!!! NADPH made here!!!!!! 13. Excited electrons move through PS2 and then PS1 After being sent up to the primary electron acceptor for photosystem 1, the excited electrons board the NADPH bus 14. The excited electrons flow through photosystem 2 repeatedly to make lots of ATP 15. Light INdependent Sugar formation occurs here! Energy given off by excited electrons used to combine water and carbon dioxide to form sugars Occurs in the stroma of the chloroplast 16. Carbon fixation 3 Phosphoglycerate reduction Regeneration of CO2 receptor 17. C3 pathway C4 pathway CAM pathway Photorespiration