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Understanding Photosynthesis: Key Players ATP and NADPH

This chapter explores the critical roles of ATP and NADPH in the process of photosynthesis. ATP, or adenosine triphosphate, acts as an energy-storing molecule that can be reused, while NADPH carries electrons and protons, facilitating energy transfer. We examine how autotrophs harness sunlight to convert it into chemical energy, while heterotrophs acquire energy from consuming other organisms. Additionally, we discuss the nature of light, the pigments involved in photosynthesis like chlorophyll and carotenoids, and the overall structure of chloroplasts, leading to the chemical equations summarizing this vital process.

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Understanding Photosynthesis: Key Players ATP and NADPH

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  1. Chapter 8Photosynthesis

  2. Two Important “Players” ATP e- e- NADPH

  3. ATP • ATP- adenosine triphosphate • Energy storing molecule • Reusable ATP ADP + P + Energy

  4. NADPH NADP+ + 2 e- + H+ NADPH • Carries 2 electrons • Reusable e- e- NADPH

  5. Photosynthesis • All organisms get energy to make ATP from food • Autotrophs- use sunlight energy to make food through photosynthesis • Heterotrophs- get food by consuming other organisms

  6. The Nature of Light • Light travels in waves of varying wavelengths in the electromagnetic spectrum.

  7. Pigment • A compound that absorbs light What the important pigment found in plants?

  8. Chloroplast Pigments • *Chlorophyll a- blue-green • Chlorophyll b- yellow-green • Carotenoids • Carotene- orange • Xanthophyll- yellow • * = primary pigment (most abundant)

  9. The Structure of a Chloroplast

  10. An Overview of Photosynthesis • Chemical Equation:

  11. An Overview of Photosynthesis • Summary: • Light Dependent (location: thylakoid membrane) Light energy chemical energy (NADPH & ATP) 2. Light Independent (location: stroma) Chemical energy (+NADPH & ATP) glucose

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