In eukaryotes, activator proteins bind to _____; generalized transcription factors bind to _____10/22/2023 ![]() ![]() In addition, separate RNA polymerases (which are similar to bacterial RNA polymerases) are found in chloroplasts and mitochondria, where they specifically transcribe the DNAs of those organelles. Some of the small RNAs involved in splicing and protein transport (snRNAs and scRNAs) are also transcribed by RNA polymerase III, while others are polymerase II transcripts. ![]() RNA polymerase III transcribes the genes for tRNAs and for the smallest species of ribosomal RNA (5S rRNA). RNA polymerase I is specifically devoted to transcription of the three largest species of rRNAs, which are designated 28S, 18S, and 5.8S according to their rates of sedimentation during velocity centrifugation. Protein-coding genes are transcribed by RNA polymerase II to yield mRNAs ribosomal RNAs (rRNAs) and transfer RNAs (tRNAs) are transcribed by RNA polymerases I and III. Eukaryotic cells contain three distinct nuclear RNA polymerases that transcribe different classes of genes ( Table 6.1).
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