lecture_1b - What distinguishes living organisms 1...

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What distinguishes living organisms? 1. Structurally complicated and highly organized a. intricate internal structures b. many kinds of complicated molecules proteins, DNA, RNA, starches, and lipids etc. (inanimate objects sand clay are mixtures of simple compounds) 2) Living organisms: a. extract b. transform ENERGY c. store d. use 1
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Living things can extract energy from the environment Chemical: Chemoautotrophs or lithoautotrophs H 2 S 2H + +S +2e - 2NH 3 + 4O 2 2HNO 3 + 2H 2 O 4FeCO 3 + O 2 + 6H 2 O 4Fe(OH) 3 + 4CO 2 or Sunlight: Photoautotrophs nCO 2 + nH 2 O (CH 2 O) + nO 2 3
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3) Most characteristic attribute of living things is self- replication and self assembly it is the quintessence of the living state 1 single bacteria 10 9 in 24 hr inanimate matter does not do this also the near-perfect fidelity of this process is awesome! A crystal at equilibrium grows but life at equilibrium is death! Life is a set of relationships characterizing the nature, function and 4
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Philosophers thought life contained a “vital force” or vitalism but this has been rejected by modern science . Important insights and practical applications in medicine, agriculture, nutrition and industry have come from Biochemistry but ultimately biochemistry is still concerned with the WONDER OF LIFE 5
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A Brief History of Biochemistry Early 19th Century World made of either "living matter" (organic) or "non-living matter" (inorganic).(Vitalism) 1828 Friedrich Wohler accomplished the synthesis of Urea from inorganic matter. 1897
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This note was uploaded on 02/22/2011 for the course BCHS 3304 taught by Professor Johnson during the Spring '08 term at University of Houston.

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lecture_1b - What distinguishes living organisms 1...

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