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Photosynthesis: Using Light Energy to Synthesize Biomolecules

Explore the process of photosynthesis, where light energy is converted into chemical energy to generate ATP and NADPH. Discover the light-dependent and light-independent reactions involved in synthesizing organic compounds.

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Photosynthesis: Using Light Energy to Synthesize Biomolecules

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  1. Photo synthesis • Using light energy to synthesize biomolecules

  2. Overview of Photosynthesis • Photosynthesis has two parts: • Light-dependent reactions convert light energy into chemical energy by using light energy to make ATP and NADPH. • Energy from ATP and NADPH drives light-independent reactions that produce energy-rich carbon compounds.

  3. Thinking Question: • Where does wood come from?

  4. Photosynthesis in the leaf

  5. The Chloroplast

  6. Use of light in photosynthesis

  7. Chemiosmosis in PSII

  8. Chemiosmosis in PSII

  9. Light-independent Reactions The Calvin-Benson, or C3 cycle, is a cyclical series of chemical transformation that produces a 3-carbon compound, G3P.

  10. Details of the Calvin-Benson Cycle, where organic GP3 is synthesized from inorganic carbon dioxide. GP3 is then used to make glucose, fatty acids, and amino acids (with the addition of nitrogen).

  11. Relationships between the light-dependent and light independent reactions.

  12. Relationships between photosynthesis and cellular respiration. Both occur in a plant cell.

  13. C3 plants and photorespiration • Plants that live where there is abundant water use the light-independent reactions we’ve already looked at: the C3 system. • But if plants are water stressed, their stomata close, and they can’t get more carbon dioxide. • Oxygen accumulates, and degrades RuBP in a wasteful process called photorespiration.

  14. C4 plants and photorespiration • Plants adapted to dry areas have a way of coping with having to close their stomata in the heat of the day. • C4 plants capture carbon dioxide and store in in a 4-carbon compound. They add a second cycle to the light independent reactions to release stored carbon so the C3 cycle can continue.

  15. Summary • Light-dependent reactions use light energy to produce ATP and NADPH to run the light-dependent reactions. • Light independent reactions take in inorganic carbon dioxide and use it to synthesize organic compounds.

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