What have we learned about RNA structure and function so ... In comparison, eukaryotic cells contain two types of rRNA genes that give rise to four rRNA species: the 28S, 5.8S, 5S, and 18S rRNAs.

However, the structure of chromatin also appears to serve a second, possibly more important role, in that it gives eukaryotic cells the capability to exert complex levels of control over gene ...