DNA Structure and Replication

ID #1501

During today's lecture you discussed the H4 protein and illustrated how it was highly conserved by using the example of the cow and the pea plant, which differ by only two amino acids. However, when you mentioned this we were discussing eukaryotes and isn't a pea plant a prokaryote? Could you explain the H4 comparison in the context of eukaryotic cells and prokaryotic cells?


No, plants are most definitely eukaryotic organisms. All complex multicellular organisms are eukaryotes, as well as even some unicellular organisms like yeast cells, amoeba, paramecium, and so on that you may have looked at in a previous biology class. The prokaryotic world--vast as it is--is "limited" to bacteria and archae, the only types of organisms that lack a nucleus. So in case you're wondering, yes, yeast cells have histones, and yes, the sequence of those histones is quite similar to the sequence of that same histone in you!

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