BB lecture 9-26 life origin & prokaryotes

BB lecture 9-26 life origin & prokaryotes - Chapter...

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Chapter 26 [added: pp. 512-516] and Chapter 27 [pp.534-541] 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 Explain how organic polymers could have formed in early Earth prior to the existence of enzymes. • Draw/compare Gram-positive bacteria and Gram-negative bacteria cell walls. • Know the sources of energy and carbon for photo/chemo - autotrophs/heterotrophs Terms to know include: Oparin-Haldane hypothesis, abiotic synthesis, protobionts, ribozymes, “RNA world”, peptidoglycan, Gram-positive, Gram-negative, lipopolysaccharide, obligate aerobes, facultative anaerobes, obligate anaerobes…
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Figure 26.10 Land plants Animals Multicellular eukaryotes Single-celled eukaryotes Atmospheric oxygen Prokaryotes Origin of solar system and Earth Humans Ceno- zoic Meso- zoic Paleozoi c Archaean Eon Billions of years ago Proterozoic Eon 1 2 3 4 “Earth” starts here (~4.5 bya) A clock-like arrangement of the geological record
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How did life begin. .?
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Gallup Poll – survey results plus UT students in Bio 311C ( ’05 and ‘06 ) Humans developed Humans developed God created No w/ God guiding but God had no part humans in opinion the process in the process present form or “other 2006 44% 15% 38% 2% 43 24 25 7 2005: 36 31 25 7 34 32 28 6 2001: 37 12 45 6 1999: 40 9 47 4 1997: 39 10 44 7 1993: 35 11 47 7 1982: 38 9 44 9
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hypothesis Four stages:
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This note was uploaded on 10/06/2010 for the course BIO 311C taught by Professor Satasivian during the Fall '08 term at University of Texas at Austin.

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BB lecture 9-26 life origin & prokaryotes - Chapter...

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