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Lecture_10-4 - BIOL 214 GENES ECOLOGY AND EVOLUTION PEPPER...

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Suppl. to Lecture 14, page 1 BIOL 214 GENES, ECOLOGY AND EVOLUTION / PEPPER LECTURE 16 (October 4, 2006) SUPPLEMENT READING ASSIGNMENTS: Origins of Life and Precambrian Evolution, pages 349-369 (optional reading. We will not cover in lecture, but may be helpful background). Origins of Life and Precambrian Evolution, pages 370-392. READ AHEAD Mutation and Genetic Variation, pages 197-207 KEY CONCEPTS: Gene — discrete unit of hereditary material that specifies a biological function Origins of life Not a part of the Theory (body of knowledge) of Biological Evolution A separate field more closely allied with organic and physical chemistry Difficult to study Little or no fossil evidence Difficult to recognize primitive ‘life’ forms (if you don’t know what to look for) Earliest ‘life’ forms were almost certainly some form of chemoheterotroph that would have consumed any more primitive entities that were present (destroying any evidence thereof) ‘Molecular fossils’ found in living organisms Adenine, ribose ribonucleotides cAMP — nearly universal cell signaling/signal transduction molecule ATP— universal energy ‘currency’
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