Lecture9_handout_14Sep11 - BioEE1780 Evolution and...

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BioEE1780 Evolution and Biodiversity Today’s lecturer: Cole Gilbert Lecture 9: Sept. 14, 2011 Diversity 2 page -1 Diversity of “prokaryotes” Readings: Life, 9 th ed. Chapter 26 Prokaryotic organisms, Bacteria and Archaea, lack a nucleus and membrane-bound organelles, such as mitochondria and chloroplasts. They were once thought to represent an evolutionary grouping of organisms that was the sister group to the eukaryotes. We know now that archaeans are more closely related to eukaryotes than to bacteria, thus the grouping “prokaryotes” does not represent a monophyletic grouping and I will try not to refer them as such, or if I do, I will put the term in quotes to let you know that “prokaryotes” do not represent a good clade, but a simple term of convenience that describes one shared attribute of bacteria and archaeans. The chapter in the text does a good job of encapsulating their diversity, but it is really too vast to cover in a single chapter, not to mention in a single lecture. If you are really interested in these fascinating organisms (you are composed of more bacterial cells than human cells !), you should plan to take the BioMI 2900/2910 course. In reading the text, you should attend to most of the chapter, except sect. 26.6, which deals with viruses. They are certainly interesting and important, but
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Lecture9_handout_14Sep11 - BioEE1780 Evolution and...

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