Prokaryotic Cell Division, Chromosomes prokaryotic cell division- division by binary fission • genome made of single, circular DNA found in nucleoid area • replication of DNA begins at specific site and goes bidirectionally around to specific site of termination • cell elongates, DNA gets attached to the membrane • septum- new membrane growing near the midpoint during division o composed of FtsZ protein ring • eukaryotic cells developed mitosis to deal w/ larger, nucleus-enclosed genomes mitosis- occurs differently in different organisms • protists - 2 ways o microtubules (w/ tubulin) pass through nucleus membrane tunnels and sets up axis for division (nucleus remains intact) o microtubule spindle forms between centrioles at opposite sides; kinetochore microtubules pull chromosomes to each pole (nucleus remains intact) • yeasts - spindle microtubule forms inside nucleus between poles o single kinetochore microtubule attaches to chromosomes, pulls them to each end •
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This note was uploaded on 01/04/2012 for the course BSC BSC1005 taught by Professor Orlando,rebecca during the Fall '10 term at Broward College.