Abstract
Summary Chloramphenicol and spectinomycin selectively inhibit amino acid incorporation into Fraction I protein but have no effect on incorporation into Fraction II protein. Neither antibiotic depresses specific radioactivities of either 70 or 80 S ribosomes. Cycloheximide inhibits incorporation of amino acid into Fraction I and Fraction II proteins equally. The specific radioactivities of 70 S and 80 S ribosomes are depressed equally by cycloheximide. These results suggest that most of the proteins of 70 S chloroplast ribosomes are made outside the chloroplast. They also confirm previous findings that accumulation of ribulose-1,5-diphosphate carboxylase is inhibited by both chloramphenicol and cycloheximide.
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