title: Phylogenetic origin of the chloroplast and prokaryotic nature of its ribosomal RNA.
abstract: The 16S ribosomal RNA of the Euglena gracilis chloroplast has been characterized in terms of its two-dimensional electrophoretic "fingerprint" (T1 ribonuclease). Results show it to be a typically prokaryotic 16 S rRNA. By the present criterion, different chloroplasts are shown to be related to one another and at least distantly to blue-green algae and perhaps to Bacillaceae. These results argue in favor of an endosymbiont origin of the chloroplast.
mesh_terms: D001483:Base Sequence; D005075:Biological Evolution; D002736:Chloroplasts / Q000032:analysis*; D003090:Coliphages / Q000201:enzymology; D004591:Electrophoresis, Polyacrylamide Gel; D005056:Euglena gracilis / Q000032:analysis* / Q000648:ultrastructure; D009841:Oligonucleotides / Q000032:analysis / Q000302:isolation & purification; D012335:RNA, Ribosomal / Q000032:analysis*; D012260:Ribonucleases; D013045:Species Specificity
chemical_list: D009841:Oligonucleotides; D012335:RNA, Ribosomal; D012260:Ribonucleases