Final answer:
One incorrect statement regarding 5S rRNA in eukaryotic cells is that they are transcribed by RNA Polymerase I and require extensive posttranscriptional processing, whereas they are actually transcribed by RNA Polymerase III with minimal processing.
Step-by-step explanation:
In eukaryotic cells, 5S rRNA is encoded by a large number of identical genes. One statement about 5S rRNA that is not true is that the 5S rRNA genes are transcribed by RNA Polymerase I and require extensive posttranscriptional processing. In fact, these 5S rRNA genes are transcribed by RNA Polymerase III and require minimal posttranscriptional processing.