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Friday, November 8, 2013

Dna Biology

February 28, March 1 Meiosis leads to the business of sperm and peltgametes Mitosis leads to the production of somatic cells body belonging Mitosis and Cell perpetual recurrence Growth- trillions of genetically identical cells that suffer up our body Wound repair- scrape, mitosis and cytokinesis generate cells that repair your skin Reproduction- production of genetically identical cells chromo about consists of a single DNA that is wrapped some proteins . Interphase vs Mitosis phase Interphase is an kl active time; cell is either growth and preparing to ramify or fulfilling its spi,./ecialized its specialized function in a cellular individualnondividing pahse M phase- dividing phase S pahse- reappearance of genetic fabric is separated Control of the cell rhythm Before cells enter M, phase, there is a regulative mite that helps cells go into M phase from G2 phase. The regulatory molecule is called MPF Mitosis Promoting cypher Made up of 2 distinct polyp eptide subunits Protein Kinase- and enzyme that catalyzes the carry-over of orthophosphate group from ATP to a target protein--CDK So MPF phosphorylates a protein that triggers mitosis Other subunit is called Cyclin MPF is in initiate by phosphorylation at two sites and is activated by dehosphorylation at one site.
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Checkpoints cell cycle fudge G1 checkpoint- Size, if the cells are too small the its daughter cells usage be fucked so it wont return the checkpoint Availability of nutrients- if not nutrients it wont replicate Social signals- the pass or dont pass through g1 phase in response to early(a) cells vilify to P53- If Dna is damage, th! en the protein p53 activates apoptosis G2 Checkpoint- if DNA is damaged or chromosomes are not replicated correctly then MPFs dephosphorylation is blocked Final Checkpoint- Metaphase checkpoint If not all chromosomes are given over properly to the spindle apparatus, M phase arrests at metaphase. G1 also prevents the growth of mature cells by putting them into a g0...If you require to get a adept essay, order it on our website: OrderCustomPaper.com

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