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Chapter 8 Light and Pigments. Need To Know How photosystems convert light energy into chemical energy. (There will be more on this in the next couple.

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Presentation on theme: "Chapter 8 Light and Pigments. Need To Know How photosystems convert light energy into chemical energy. (There will be more on this in the next couple."— Presentation transcript:

1 Chapter 8 Light and Pigments

2 Need To Know How photosystems convert light energy into chemical energy. (There will be more on this in the next couple of days.)

3 Figure Light H2OH2O Chloroplast Light Reactions P i ADP NADP   O2O2 ATP NADPH CO 2 Calvin Cycle Two Stages of Photosynthesis Calvin Cycle [CH 2 O] (sugar)

4 Figure 8.15 Electron transport chain Higher [H  ] P i HH CHLOROPLAST STRUCTURE Inter- membrane space MITOCHONDRION STRUCTURE Thylakoid space Inner membrane Matrix Key Lower [H  ] Thylakoid membrane Stroma ATP synthase ADP  HH Diffusion

5 Concept 8.2: The light reactions convert solar energy to the chemical energy of ATP and NADPH Chloroplasts are solar-powered chemical factories. Their thylakoids transform light energy into the chemical energy of ATP and NADPH. © 2014 Pearson Education, Inc.

6 Light travels in waves Visible light Shorter wavelength Longer wavelength Lower energy Higher energy nm

7 Figure 8.7 Reflected light Light Absorbed light Chloroplast Granum Transmitted light

8 Figure 8.9a Chloro- phyll a Absorption of light by chloroplast pigments Chlorophyll b Carotenoids (a) Absorption spectra Wavelength of light (nm)

9 Figure 8.9b (b) Action spectrum Rate of photosynthesis (measured by O 2 release)

10 Figure 8.9c Filament of alga Aerobic bacteria (c) Engelmann’s experiment

11 Figure 8.9 Chloro- phyll a Rate of photosynthesis (measured by O 2 release) Results Absorption of light by chloroplast pigments Chlorophyll b Carotenoids Filament of alga Aerobic bacteria (a) Absorption spectra (b) Action spectrum (c) Engelmann’s experiment Wavelength of light (nm)

12 Figure 8.10 Hydrocarbon tail: interacts with hydrophobic regions of proteins inside thylakoid membranes of chloroplasts; H atoms not shown Porphyrin ring: light-absorbing “head” of molecule; note magnesium atom at center CH 3 in chlorophyll a CHO in chlorophyll b CH 3 A slight structural difference between chlorophyll a and chlorophyll b causes them to absorb slightly different wavelengths.

13 Figure 8.11 Photon (fluorescence) Ground state (b) Fluorescence Excited state Chlorophyll molecule Photon Heat e−e− (a) Excitation of isolated chlorophyll molecule Energy of electron


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