Abstract
THE distribution of carbon-14 in the glucose moiety of sucrose, glucose phosphate and starch formed from carbon-14 dioxide during short-time photosynthesis in Chlorella and the leaves of higher plants has been shown to be asymmetric1. It was proposed that either glucose was not formed by the condensation of two triose phosphates of similar tracer distribution or that a pool of unlabelled dihydroxyacetone phosphate was present in the cell, causing a dilution of the upper three carbon atoms of the hexose. To test the validity of the latter suggestion, the intact spinach chloroplast free of much cytoplasic material was employed.
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