1BB lecture 9-23-09 life origin & prokaryotes

1BB lecture 9-23-09 life origin & prokaryotes - Chapter 25...

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Unformatted text preview: Chapter 25 (pp.507-512) Early Life on Earth Learning objectives: • Describe the four stages of the hypothesis for the origin of life on Earth by chemical evolution • Describe the design and the significance of the Miller-Urey experiment Terms to know include: Oparin-Haldane hypothesis, abiotic synthesis, protobionts, ribozymes, “RNA world”, relative age/absolute age of fossils… Chapter 26 (pp.552-553) “Tree”of Life, or “Ring” of Life(?) • Understand the portrayals of domain relationships are hypothetical, and change with new information Chapter 27 (pp.556-560, 564,565) The Prokaryotes • Draw/compare Gram-positive bacteria and Gram-negative bacteria cell walls. • Describe the nutritional types of cells (regarding carbon and energy sources) Terms to know include…peptidoglycan, Gram-positive, Gram-negative, lipopolysaccharide, obligate aerobes, facultative anaerobes, obligate anaerobes… Fig. 25-7 Animals Colonization of land P a l e o z o i c M e s o- z o i c Humans Ceno- zoic Origin of solar system and Earth Prokaryotes Proterozoic Archaean B i l l i o n s o f y e a r s a g o 1 4 3 2 Multicellular eukaryotes Single-celled eukaryotes Atmospheric oxygen “Earth” starts here (~4.5 bya) Early Earth – Origin of “Life” a hypothesis Four stages: 1. Abiotic synthesis of organic monomers (e.g., amino acids) 2. Abiotic synthesis of polymers (e.g., polypeptides) 3. Protobionts (membranous enclosures) 4. Self-replicating molecules The Oparin-Haldane Hypothesis...
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This note was uploaded on 01/20/2010 for the course BIO 50415 taught by Professor Batterton during the Fall '09 term at University of Texas.

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1BB lecture 9-23-09 life origin & prokaryotes - Chapter 25...

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