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Light reactions in higher plants-electron carriers and proton movement, which makes ATP-sound

Light reactions in higher plants-electron carriers and proton movement, which makes ATP-sound familiar? 16-42, 658. Photorespiration- Competing against photosynthesis-liberates CO2 instead of fixing it into a 3-carbon molecule- All Rubisco’s do it 16-50, 668.

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Light reactions in higher plants-electron carriers and proton movement, which makes ATP-sound

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  1. Light reactions in higher plants-electron carriers and proton movement, which makes ATP-sound familiar? 16-42, 658

  2. Photorespiration- Competing against photosynthesis-liberates CO2 instead of fixing it into a 3-carbon molecule- All Rubisco’s do it 16-50, 668

  3. Xerophytic plants- (can withstand hot, dry conditions) have modification that allows concentration of CO2 Normally hot weather causes plants to close stomata, which lowers internal [CO2], which favors photorespiration because of Km of RUBISCO 16-51, 668

  4. C4 photosynthesis called C4 because it starts with 4 carbon molecules, instead of ‘regular’ photosynthesis which starts with 3 carbon molecules (at least, those are among the first isolated) 16-52, 669

  5. As much as 50% of CO2 fixed by rubisco is reoxidized to CO2 by photorespiration in C3 plants -high O2 concentration in atmosphere C4 plants phosphoenolpyruvate carboxylase has higher affinity (lower Km) for CO2 than does rubisco- result can be 2-3 fold greater photosynthetic production in C4 plants than in C3 plants 16-48, 665 catalytic domain of RUBISCO

  6. What was first photosynthetic organism? Carl Bauer’s lab, Indiana Univ.-looked at >100 genes involved in photosynthesis, then did phylogenetic analysis to find out which most ancient. Purple bacteria probably first group of organisms that were photosynthetic, not green algae.

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