phothosynthesis presentation

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Some plants have developed a preliminary step  to the Calvin Cycle (which is also referred to as  a C-3 pathway), this preamble step is known as  C-4.  While most C-fixation begins with RuBP, C-4  begins with a new molecule,  phosphoenolpyruvate (PEP), a 3-C chemical  that is converted into oxaloacetic acid (OAA, a  4-C chemical) when carbon dioxide is combined  with PEP. 
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The OAA is converted to Malic Acid and then  transported from the mesophyll cell into the  bundle-sheath cell, where OAA is broken  down into PEP plus carbon dioxide.  The carbon dioxide then enters the Calvin  Cycle, with PEP returning to the mesophyll  cell.  The resulting sugars are now adjacent to the  leaf veins and can readily be transported  throughout the plant.  Figure 4.17
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C-4 photosynthesis involves the separation of carbon fixation and carbohydrate synthesis in space and time. Back
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