BIO 311C_Spr11_Chapter 27

BIO 311C_Spr11_Chapter 27 - Chemical evolution and...

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Unformatted text preview: Chemical evolution and Prokaryotic cells Relevant aspects of pages from Chapter 25 (507-510) and Chapter 27 (556-561) Some slides adapted from: gasp.med.harvard.edu/micro200/Kolter/Kolter3.ppt Chemical Evolution Hypothesis CHEMICAL EVOLUTION HYPOTHESIS 1. Simple molecules were present in the atmosphere of ancient Earth, including carbon monoxide (CO), carbon dioxide (CO 2 ), hydrogen (H 2 ), ammonia (NH 3 ), water (H 2 O), and nitrogen (N 2 ). 2. The energy in sunlight drove reactions among the simple molecules, resulting in compounds such as formaldehyde (H 2 CO) and hydrogen cyanide (HCN). 3. When heated, compounds containing single carbon atoms reacted to form more complex molecules containing carbon-carbon bonds, including acetaldehyde, glycine, and ribose (a sugar). Light energy Hydrogen cyanide Formaldehyde Ribose Glycine Acetaldehyde Heat Freeman, 3rd ed Miller-Urey Experiment CH4, NH3, H2 Atmosphere Abiotic synthesis of polymers • Small organic molecules – Polymerize when they are concentrated on hot sand, clay, or rock Protobionts •...
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BIO 311C_Spr11_Chapter 27 - Chemical evolution and...

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