Lecture_13_Origin_Life

Lecture_13_Origin_Life - 1 1 Life on Earth Life A...

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Unformatted text preview: 1 1 Life on Earth Life: A self-sustained chemical system capable of self-replication and evolution Life on Earth: Mostly C,H,O,N,P 2 Life Today Nucleic Acids Building blocks of: DNA : information, replication RNA : information -> catalyze reactions Amino Acids Building bocks of: Proteins , such as enzymes which catalyze reactions that build complex molecules and structures Earliest Life may have had only an RNA like substance which both carried genetic information and catalyzed reactions 2 3 Building Life from scratch Build amino acids (not so hard) Build nucleic acids (not so easy) Isolate from environment - cell membrane (no so hard) 4 Miller-Urey Experiment (1950s) Get amino acids! Problem: Early atmosphere probably not like this Solution: Specialized environment (deep sea vent) or extraterrestrial origin CH 4 , NH 3 , H 2 0, H 2 (early atmosphere) Spark (lightning) 3 5 Interstellar dust clouds have similar conditions to Miller-Urey Experiment. Can amino acids survive heat of impact? 6 Building Life from scratch Build amino acids (not so hard) Build nucleic acids (not so easy) Evaporating pond/Intertidal zone can help concentrate ingredients Mineral templates can help organize ingredients Isolate from environment - cell membrane (no so hard) Some simple proteins will form a bubble-like structure when heated 4 7 Which of the following is easy to make in the laboratory from inorganic chemicals?...
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Lecture_13_Origin_Life - 1 1 Life on Earth Life A...

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