[N]o bacteria coat their DNA with s: their DNA is naked. The histones not only protect eukaryotic DNA from chemical attack, but also guard access to … - Nick Lane

Viruses are quite sophisticated in the sense that they're forming virion particles and they're infecting other cells... s and things... selfish genes, I suppose in the broadest sense.

The sequence of letters in a specifies the sequence of s in a protein. If the sequence of letters is changed—a ''—this may change the structure of the protein (...not always, there is some redundancy... technically degeneracy..—several combinations... can code for the same amino acid.)

[W]e are biochemically quite simple in comparison bacteria. Simpler than bacteria. In terms of our metabolic biochemistry we are really limited. ...[W]e have ...across the entire domain of s, about the same degree of metabolic sophistication as a single bacterial cell.