Early life, Proteins - sg-1

Early life, - MEMBRANES TRANSPORT AND SIGNALING Early Life and Proteins ch 3 3.0 3-2&3-3 early life amino acids polypeptide structure and folding

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MEMBRANES, TRANSPORT AND SIGNALING: Early Life and Proteins ch 3 early life, amino acids, polypeptide structure and folding ch 6 lipids, membrane structure and function- ch 4, 4.0, 4.3, and 4.4 RNA world ch 36 36.0 and 36-1 transport in vascular plants - water potential ch 8 8-3 signal transduction ch 8 8.0, 8-1&8-2 – cell walls, ECM, junctions (omit p. 166M-168 adhesions ) I. EARLY LIFE AND THE RNA WORLD HYPOTHESIS example of theory – tested, modified, retested…. . A, Chemical evolution - hypothesis proposed by Oparin(1923) and modified by Haldane (1929) 1. chemical rxn in atmosphere and ocean of ancient Earth formation of complex C containing compounds. Fueled by sunlight and other sources 2. current theory of chemical evolution -production of small reduced C: HCN and fomaldehdye – H 2 CO -these amino acids, sugars and N bases prebiotic soup in shallow waters of oceans -these monomers polymers like proteins, nucleic acids, carbos - “life” became possible when 1 of these was able to copy itself self replicating molecule - NOW biological evolution B. Early Origin of Life experiments - Stanley Miller - 1953 Can organic molecules be synthesized from the simple molecules and conditions believed to be present in ancient Earth? Exp. To simulate these conditions: fig 3-1 Mix methane, ammonia, and hydrogen with heat and electricity Demonstrated that chemical evolution could occur ….but Was he right in his assumptions? Box 3.1 yes, chemical evolution can occur BUT He was probably not correct in his assumptions about the Conditions in shallow oceans of ancient Earth Probably not methane but CO 2 and CO When substitute CO2 for methane – no chemical evolution BUT- when CO, H2O and high energy radiation like sunlight Methane, formaldehyde Alternatively, maybe the chemical evolution took place near a thermal
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This note was uploaded on 04/18/2008 for the course BIO 220 taught by Professor Frielle during the Fall '07 term at F & M.

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Early life, - MEMBRANES TRANSPORT AND SIGNALING Early Life and Proteins ch 3 3.0 3-2&3-3 early life amino acids polypeptide structure and folding

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