Histones are the only proteins known to be associated with chromatin. Eukaryotic organisms have three different RNA polymerases. Sigma factors in eukaryotes show a large degree of homology with their prokaryotic counterparts. RNA polymerase III promoters are situated within the genes they control. The 72 base-pair repeat upstream sequence found in the SV40 tumor virus is actually a promoter.
Eukaryotic genes show colinearity between genes and gene products.
Transfer RNAs have been found to contain only one intron or none at all. Briefly describe the lariat model of RNA precursor splicing. List three ways in which eukaryotic mRNAs differ from prokaryotic mRNAs. Describe or draw what occurs in rolling circle replication. Draw what is meant by bidirectional replication, and show how a pulse-labelling experiment demonstrates bidirectional replication.