Ch08_Lecture

Ch08_Lecture - 8 Photosynthesis: Energy from Sunlight 8...

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8 Photosynthesis: Energy from Sunlight
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8 Photosynthesis: Energy from Sunlight 8.1 What Is Photosynthesis? 8.2 How Does Photosynthesis Convert Light Energy into Chemical Energy? 8.3 How Is Chemical Energy Used to Synthesize Carbohydrates? 8.4 How Do Plants Adapt to the Inefficiencies of Photosynthesis? 8.5 How Is Photosynthesis Connected to Other Metabolic Pathways in Plants?
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8.1 What Is Photosynthesis? Photosynthesis : “synthesis from light” The broad outline: Plants take in CO 2 and release water and O 2 Light is required 2 6 12 6 2 2 6 6 6 O O H C O H CO + +
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Figure 8.1 The Ingredients for Photosynthesis
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8.1 What Is Photosynthesis? Ruben and Kamen determined the source of O 2 released during photosynthesis by using radioisotope tracers. O H O O H C O H CO 2 2 6 12 6 2 2 6 6 12 6 + + +
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8.1 What Is Photosynthesis? Two pathways: Light reactions : light energy converted to chemical energy (in ATP and NADPH + H + ) Light-independent reactions : use the ATP and NADPH + H + plus CO 2 to produce sugars
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Figure 8.3 An Overview of Photosynthesis
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8.2 How Does Photosynthesis Convert Light Energy into Chemical Energy? Light is a form of electromagnetic radiation , which comes in discrete packets called photons and behave as particles. Light also behaves as if propagated as waves. Energy of a photon is inversely proportional to its wavelength .
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8.2 How Does Photosynthesis Convert Light Energy into Chemical Energy? When a photon meets a molecule it can be: Scattered or reflected Transmitted or pass through the molecule Absorbed— the molecule acquires the energy of the photon. The molecule goes from ground state to excited state .
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Figure 8.4 Exciting a Molecule (A)
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Figure 8.4 Exciting a Molecule (B) Energy from the photon boosts an electron into another shell
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8.2 How Does Photosynthesis Convert Light Energy into Chemical Energy? Photons can have a wide range of wavelengths and energy levels. Molecules that absorb specific wavelengths in the visible range of the spectrum are called pigments .
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Figure 8.5 The Electromagnetic Spectrum
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8.2 How Does Photosynthesis Convert Light Energy into Chemical Energy? Absorption spectrum : plot of wavelengths absorbed by a pigment
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Figure 8.6 Absorption and Action Spectra (Part 1)
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8.2 How Does Photosynthesis Convert Light Energy into Chemical Energy? Several types of pigments absorb light energy used in photosynthesis: Chlorophylls : a and b Accessory pigments : absorb in red and blue regions, transfer the energy to chlorophylls— carotenoids , phycobilins
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Figure 8.7 The Molecular Structure of Chlorophyll (Part 1)
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Ch08_Lecture - 8 Photosynthesis: Energy from Sunlight 8...

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