Lec9_Prokaryote_handout.doc - BioG1780 Evolution and...

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BioG1780 Fall 2010 Evolution and Biodiversity Today’s lecturer: Harry Greene Lectures 9: September 15, 2010 1. “Prokaryote” diversity. In this lecture we will cover the characteristics and importance of both groups of “prokaryotes,” Bacteria and Archaea. Our goal is to gain an understanding of their biology and diversification, as well as their significance in many aspects of ecology (including human diseases) and for understanding the evolution of eukaryotes. 2. What are “prokaryotes”? Prokaryotes are generally among the smallest of all life forms, and although they can be colonial they are never multicellular in the sense of division of labors. They include two taxa, Bacteria and Archaea, often discussed collectively as “prokaryotes” (literally “before nucleus”). 3. “Prokaryote” form and function : Prokaryotes come in several shapes, most frequently as rods (bacilli), spheres (cocci), and spirals (helices). They variously exhibit diverse movements, including corkscrew-like spiraling by means of axial filaments, adjustments up and down in water by means of gas vesicles, and swimming by means
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This note was uploaded on 12/20/2011 for the course BIOG 1440 taught by Professor Owens during the Spring '10 term at Cornell.

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Lec9_Prokaryote_handout.doc - BioG1780 Evolution and...

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