12 The Origin of the Metazoa

12 The Origin of the Metazoa - The Origin of the Metazoa...

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The Origin of the Metazoa and the Evolution of Life on Earth Monday, June 13, 2011
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Monday, June 13, 2011
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The Archaea are different from bacteria: (1) mainly anaerobic or thermophilic (2) enzymes, genes and biochemistry very different from bacteria. (3) probably survivors from the very early days of life on earth, when the atmosphere lacked oxygen, and high temperatures prevailed. * * The procaryotes The Eucaryotes Monday, June 13, 2011
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Monday, June 13, 2011
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Procaryotes Eucaryotes Small, 1-10 mu larger, 10-100 mu Nuclear material not membrane bound Nuclear material double membrane bound no mitotic apparatus mitotic apparatus present no mitochondria mitochondria with double membranes no cilia or flagellae cilia no chloroplasts chloroplasts with double membranes circular, free DNA DNA on chromosomes no membrane systems cellular membrane system e.g. blue-green algae, protozoa bacteria animals, plants spirochaetes Procaryotes vs. Eucaryotes Monday, June 13, 2011
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Almost certain that eukaryotes evolved from prokaryotes because : 1. Both use RNA and DNA are the genetic material 2. Both use the same 20 amino acids 3. Both have ribosomes and DNA and RNA 4. Both have a lipid bilayer cell membrane. 5. Both use L amino acids and D sugars http://www.gwu.edu/~darwin/BiSc151/Eukaryotes/Eukaryotes.html Monday, June 13, 2011
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. ..,. Eucaryotes arose 1.6 billion years ago
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This note was uploaded on 06/13/2011 for the course BIOLOGY bsc2011L taught by Professor Dr.tschinkel during the Fall '11 term at FSU.

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12 The Origin of the Metazoa - The Origin of the Metazoa...

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