Cell morphology and location and distribution of RNA polymerase in cells carrying plasmid-borne rrnB operons that synthesize transcripts that are different lengths. (A, B, and C) Plasmid pNO1302 (2.67 kb). (D, E, and F) Plasmid pDJ2791A (1.8 kb). (G, H, and I) Plasmid pDJ2791B (1.0 kb). (A, D, and G) Merged phase-contrast and DAPI fluorescence images. (B, E, and F) Fluorescence from the RNAP-GFP fusion protein. (C, F, and I) Overlays of the fluorescence from the RNAP-GFP fusion protein (green) and the fluorescence of the DAPI-stained nucleoids (red).