The role of an electron transport pathway associated with aerobic carbohydrate degradation in isolated, intact chloroplasts was evaluated. This was accomplished by monitoring the evolution of 14CO2 from darkened spinach (Spinacia oleracea) and Chiamydo- Sugars added to and starch within the chloroplast are degraded through a series of reactions resulting initially in the formation of glucose and fructose phosphates (14,25,31). The conversion of these hexose phosphates to CO2, dihydroxyacetone-P, and 3-phosphoglycerate, the major spe-'
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