Abstract
An attempt was made to determine the sites of chloroplast phenylalanyl-tRNA synthetase transcription and translation. Inhibitors of bacterial RNA and protein synthesis were added to logarithmic and stationary phase cultures of Euglena gracilis wild-type B. Logarithmic phase cultures were sensitive to both types of inhibitors. In stationary phase cultures plastid synthetase was reduced by RNA but not by protein synthesis inhibitors. The effect of the antibiotics on the mitochondrial enzyme was also noted. Several possible explanations of these resuults are discussed.
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