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Unformatted text preview: Step two: Carbon fixation The carbon fixation reactions of the second step of photosynthesis are biochemical and use the energy of ATP and the reducing power of NADPH to repackage the energy in a form that can be transported and stored, as the carbohydrates sugar and starch. Carbon fixation reactions do not require light; if cellular energy is available, the reactions occur. Plants have developed three different pathways for photosynthetic carbon fixation, one basic procedure and two modifications of it. • C3 Pathway (also called the Calvin cycle after its 1961 Nobel Prize−winning discoverer). This method is used by most common temperate zone species. • C4 or Hatch-Slack Pathway . An additional step is added to the Calvin cycle, making it more efficient for plants structurally modified to do so. Many common grasses and tropical plants use this pathway; it is a necessary adaptation in areas of high light intensity, high...
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This note was uploaded on 11/14/2011 for the course BIO 1421 taught by Professor Farr during the Fall '08 term at Texas State.
- Fall '08