Chapter 26

Chapter 26 - BIO 152 Notes Chapter 26: The Tree of Life...

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BIO 152 Notes Chapter 26: The Tree of Life Concept 26.1 [1] abiotic synthesis of amino acids/nucleotides [2] the joining of these monomers into polymers (proteins/nucleic acids) [3] molecules are put in protobionts (droplets with membranes) [4] molecules began to replicate themselves *the oldest rock found is 3.8 billion years old * earth is 4.6 billion years old [1920s] – earth’s early atmosphere was a reducing/electron-adding environment, early oceans were a soup of simple molecules [1953] – created life from an abiotic, reducing environment, new research shows though that earth’s atmosphere was neither reducing or oxidizing, but pockets of reducing atmosphere may have existed *organic compounds could have arrived on meteorites, but research shows this would only be a small contribution protobiont – aggregate of abiotically produced molecules surrounded by membrane or membrane-like structure – RNA not DNA came first, ribozymes (type of RNA) can carry out
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Chapter 26 - BIO 152 Notes Chapter 26: The Tree of Life...

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