Unformatted text preview: highly reduced, storing lots of potential energy in its electrons. To reduce CO2 to glucose, much energy and reducing power are required int he form of large numbers of ATP and NADPH molecules, respectively. 10.3.3. The light reactions require ADP and NADP+, which would not be formed in sufficient quantities from ATP and NADPH if the Calvin cycle stopped. 10.3.5. In glycolysis, G3P acts as an intermediate because it is the substrate for the next enzyme and is constantly removed, pulling the reaction equilibrium in the direction of conversion of DHAP to more G3P. In the Calvin Cycle, G3P acts as both an intermediate and a product: for every 3 CO2 molecules that enter the cycle, six G3P are formed, five of which must remain in the cycle and become rearranged to regenerate RuBP molecules. 10.4.2. Without PS I I, no O2 is generated in bundle sheath cells. This avoids the problem of O2 competing with CO2 for binding to RuBisCO in the cells....
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- Fall '08