Biology 1001A Lecture Notes - Stromatolite, Intron, Formaldehyde

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We have geological evidence of life from 4. 5 bya. Stromatolites (good example of something produced by microbial activity) Perhaps the start of life 4 billion years ago. All domains of life are derived from a single point (bacteria, archaea, Biochemical things all living things have: cells are made of lipids, genetic system based on dna, dna to rna to protein transfer of information (central dogma, common system of protein assembly, atp, glucose & glycolysis. Many initial forms of life were produced. Some had rna as genetic system, perhaps didn"t have lipid membranes. Archaea are not related to bacteria at all. Archaea and bacteria should not be grouped as prokaryotes b/c they are. Not the same thing and cannot be classified together. There is no single group of organisms. Suggests directionality in evolution (from simple complex) which is not. Evolution does not always run in this direction (another misconception) Bacteria may have been evolved through reductive evolution.

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