Diversity of Prokaryotes

Diversity of Prokaryotes - Diversity of Prokaryotes...

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Diversity of Prokaryotes 21/02/2008 18:12:00 Microbes A minority cause illness Anything small o Bacteria o Yeast o Protists o Viruses Classified by evolutionary relationships Life is divided into 3 domains (recent idea) o Bacteria o Archaea o Eukarya o Not a monophyletic group Shared by all 3 domains o Glycolysis o Semi-Conservative DNA replication o DNA encodes polypeptides o Polypeptides produced by transcription and translation o Plasma membranes and ribosomes Unique to prokaryotes o Circular chromosome (Single) o Genes organized into operons o NO Nucleus Transcripton and translation takes place in the cytoplasm o NO Organelles o NO Cytoskeleton o NO Meiosis Gene diversification occurs in more complex ways Horizontal gene transfer Antibiotic resistance Occurs within and between species o Divide by fission
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21/02/2008 18:12:00 Prokaryote environment More bacteria present in intestinal tract than cells in human body 3X10^28 in the ocean Survive in extreme conditions o Bottom of the sea o 2Km into earths crust Features Each cell is viable independently Biofilms o Gel-like substance on surface Forms when prokaryotes aggregate o Make bacteria difficult to kill o Buildup of tartar on teeth
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This note was uploaded on 04/03/2008 for the course ECOL 182 taught by Professor Chesson during the Spring '08 term at University of Arizona- Tucson.

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Diversity of Prokaryotes - Diversity of Prokaryotes...

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