BIO 311C_S10_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 Process whereby simple molecules containing C, H, O, N undergo complex chemical reactions to form organic compounds with C-C bonds Process triggered by energy source Oparin-Haldane theory Production of small compounds formaldehyde and HCN Formation of amino acids, sugars, nitrogenous bases Accumulated in Prebiotic soup oceans Formation of macromolecules Life became possible when one of the molecules could copy itself biological evolution 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,...
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BIO 311C_S10_Chapter 27 - Chemical evolution and...

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