Abstract
Etiolated Euglena gracilis cells can form chloroplasts in the absence of growth and without the net synthesis of protein and ribonucleic acid. During this process, approximately 17% of the cellular proteins appear in the chlorplasts fraction. Only the supernatant fraction shows a significant decrease, and it is tentatively concluded that the chloroplastic proteins originate in the latter fraction. The ribonucleic acid distribution in the cell is little changed. The development of chloroplasts appears to be linked with a stimulation of the uptake of adenine by the ribonucleic acid and of leucine by the protein. These stimulations are apparent in all fractions of the cells. It is concluded that no preferential synthesis of protein and RNA occurs in the chloroplasts during their final development. The formation of specific ribonucleic acid molecules during the process is indicated.
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