9.2 Transcription is catalyzed by RNA polymerase Figure 9.5 Yeast RNA polymerase has grooves that could be binding sites for nucleic acids The pink beads show a possible path for DNA that is 25 A wide and 5-10 A deep. The green beads show a narrower channe 消当Figure 9.5 Yeast RNA polymerase has grooves that could be binding sites for nucleic acids. The pink beads show a possible path for DNA that is ~25 Å wide and 5-10 Å deep. The green beads show a narrower channel. 9.2 Transcription is catalyzed by RNA polymerase