lecture 20 eukaryota student

lecture 20 eukaryota student - Eukaryotic genomes are...

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Unformatted text preview: Eukaryotic genomes are radically different from Bacterial and Archaeal genomes. The eukaryotic cell is radically different from the Bacterial and Archaeal model. The nucleus contains the genome on linear chromosomes. This creates some difFculties and opportunities. The cytoskeleton and endomembrane system are useful for intracellular motility, since diffusion won’t work. Often, there is no cell wall; the membrane can be used for phagocytosis and for exocytosis. 1. 2. 3. 1. 2. 3. The Eukaryotic cell is thought to have arisen as a merger-- perhaps a hostile takeover--between a cell wall-less Archaean and a Bacterium. The nuclear genome is a mosaic of Archaeal- Favored genes and Bacterial-Favored genes. The eukaryotic lineage is very old. Fossilized carbon derived from sterols suggests an age of about 2.7 Billion years. Their (our) core metabolism is anaerobic: glycolysis ¡nished with fermentation. Many insects provide a model for a rather extreme form of symbiosis-- endosymbiosis. Cells in the aphid abdomen are packed full with cells of a degenerate Bacterium, Buchnera . Genomic analysis of Buchnera reveals complementarity between symbiont and host. Pathways or steps for which no enzymes were identiFed are pink, as are the compounds for which de novo synthetic pathways were not identiFed. Question marks indicate that Pathways or steps for which no enzymes were identiFed are pink, as are the compounds for which de novo synthetic pathways were not identiFed....
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This note was uploaded on 04/05/2011 for the course MIC 102 taught by Professor Appleman during the Fall '08 term at UC Davis.

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lecture 20 eukaryota student - Eukaryotic genomes are...

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