| The nucleolus is where the rRNA genes are transcribed and the early assembly of ribosomes takes place. |
| In the prokaryote E. coli, seven copies of the rRNA genes synthesize about 15,000 ribosomes per cell. |
| A second regulatory protein has been shown to interact specifically with the upstream regions of rRNA P1 promoters. |
| Other evolutionary implications of rRNA stem from its ability to catalyze the peptidyl transferase reaction during protein synthesis. |
| In addition, I reexamine the controversy regarding the relationships of acanthocephalans and rotifers using all available 18S rRNA sequences. |
| Populations of organisms in a given genus that reside within the same habitats can have unique 16S rRNA genotypes. |
