BIOA02H3 Lecture Notes - Centrosome, S Phase, Spindle Apparatus
9 Jul 2013
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BIOA02H3 Full Course Notes
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8. 1 cycle of cell growth and division: an overview. Replacement of cell lost to wear and tear. Binary fission is the mechanism of prokaryotic cell division; that is splitting or dividing into two parts. Three periods: initiating dna synthesis, chromosome separation to opposite ends, and membrane that pinches together and forms the two daughter cells. 8. 2a replication occupies most of the cell cycle in rapidly dividing prokaryotic cells. Dna is hereditary material is bacteria an archaea. Single circular chromosome of double stranded dna, packed in a nucleoid. 8. 2b replicated chromosomes are distributed actively to the halves of the prokaryotic cell. Chromosome separation used to be thought of as passive, but now known to be active: Origin of replication (ori)- the region of a bacterial chromosome where replication begins (middle of cell where enzymes are) Once ori duplicates, the two new origins migrate towards the opposite ends of the cell as replication continues for the rest of the chromosomes.
