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CHAPTER 10 PHOTOSYNTHESIS

CHAPTER 10 PHOTOSYNTHESIS. Chemoautotrophs-oxidize inorganic chemicals in their environment to produce energy for metabolism. brown algae. euglena. cyanophyta—blue-green algae.

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CHAPTER 10 PHOTOSYNTHESIS

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  1. CHAPTER 10 PHOTOSYNTHESIS

  2. Chemoautotrophs-oxidize inorganic chemicals in their environment to produce energy for metabolism

  3. brown algae

  4. euglena

  5. cyanophyta—blue-green algae

  6. Van Niel determined that purple sulfur bacteria get their H’s from H2S which lead to the hypothesis that green plants took their H’s from H2O

  7. A photon’s energy is inversely proportional to its wavelength

  8. What is the problem with these shorter wavelengths? Why aren’t these longer wavelengths used?

  9. Light Reactions Thylakoid Space Stroma 2 photons of light e- H20 Path of Noncyclic electrons e- PS 680 PS II e- e- H+ e- Primary acceptor noncyclic H+ O Proton pump Water ionized by proton pump H+ H-O-H  OH- H+ H+ H+ 2 Photons of light e- Path of cyclic electrons H+ e- cytochrome H+ H+ e- PS 700 PS I Primary acceptor cyclic H+ OH- H-O-H OH- H+ H-O-H NADP+ H+ Primary acceptor noncyclic e- e- Cytochrome NADPH2 H+ Path of H+ H+ H2O Proton motive force H+ H+ H+ H+ H+ H+ H+ OH- H+ H+ ADPⓟ ATP Thylakoid Membrane

  10. Rubisco RuBP 3-Phosphoglycerate 1,3-Biphosphoglycerate Each round uses 3 ATP and 2 NADPH2 and only adds 1 CH2O Ru-P G3P

  11. http://science.nhmccd.edu/biol/ap1int.htm

  12. mesophyll area Leaf of a C4 Plant Cuticle Upper Epidermis palisade mesophyll Spongy mesophyll lower epidermis Bundle-sheath cells have chloroplasts that contain few thylakoids and no photosystems and thus do not carry on the light reactions and never produce O2 Since rubisco is sequestered here it can never oxidize rather than carboxylate RuBP. guard cells PEP carboxylase is in high conc. in the mesophyll cells stomata There is no RuBP carboxylase in the mesophyll cells but the light reactions and the fixation of CO2 occur there. PEP has a much higher affinity for CO2 than rubisco and no affinity for O2. Thus CO2 concentrations are lower.

  13. These compounds are all acids. PEP carboxylase’s higher affinity for CO2 results in lower concentrations of CO2 in the mesophyll and thus when the stomata open, there is a faster exchange.

  14. These compounds are all acidic

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