Biology 1001A Lecture Notes - Lecture 4: Archaea, Zygote, Metaphase

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Functions of cell division: grow more population, repair the wear and tear. Bacteria and archaea (prokaryotes: divide by binary fission, circular chromosomes. Plant cells that divide are located in the meristems (roots and tips) Immune cells are programmed to die if infected by viruses: cancer cells programmed to kill themselves. In plants, xylem only works when tissues are dead. Most cells are not dividing, they are doing their job in g0: liver cells are not actively dividing, cell does not grow much here, mostly carrying out function. Checkpoints regulate progression through the cell cycle: cell cycles are highly regulated. Interphase: nuclei are active and very organized. Karyotype: done by a human photographing chromosomes in metaphase, chromosomes are hardly x shaped. 2 copies, 1 from mom 1 from dad. Know what they"re made of and what they do. Microtubules -tubulin: have motor proteins associated, come from each pole, kinetochores have motor proteins which push chromosome along microtubules.

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