Biology 2581B Chapter Notes - Chapter 1: Concerted Evolution, Intracellular Parasite, Cytoskeleton
29 Mar 2017
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Reading the two empires and three domains of life in the postgenomic age. Known life forms = 2 major divisions = cellular and viral. Previous conception of the tree of life should be replaced by a complex network of treelike and netlike routes of evolution to depict history of life. Two empires and 3 cellular domains are distinct. Eukaryotes are archaebacterial chimeras that evolved as a result of an endosymbiotic event giving rise to mitochondria. Cells = membrane-enclosed compartments that contains genomic dna (chromosomes), genome replication machinery, translation system making proteins, metabolic and transport systems supplying monomers for these processes, and regulatory systems. All cells reproduce by different forms of division. Cell division = faithful segregation of copies of replicated genome into daughter cells. Cells have cytoskeleton and intracellular membrane partitions (nucleus) Electron microscopy, view things smaller than cells and viruses (obligate intracellular parasites) Never contain full complement of genes for proteins and rnas for translation/membrane function/metabolism.
