BIOL 1000 Chapter Notes - Chapter 8: Nuclear Membrane, S Phase, Microfilament
15 Dec 2013
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Membrane pinches together btwn two forming 2 cells. Circular, double stranded helical structure of dna. Replication of bacterial chromosome commences in a region called origin of replication. Interphase extends from the end of one mitosis to the beginning of the next. Cell grows and replicates dna, to prepare. Spindle microtubules attach to centromeres of chromosomes. Kinectochore binds each chromatid at the centre. Spindle microtubules move chromosomes into centre, to line up with metaphase plate. Sister chromatids separate, moving to opposite poles. They line up, and fuse together where the contents create a new cell wall. Layer of microtubules at midpoint in vesicles made by er and glogi. In s phase, centrioles get replicated along with dna. Instead they come from the multiple microctubule organizing centres surrounding the nucleus. The motion is driven by combination produced by two types of microtubules. Chromosomes walk on microtubules to opposite poles using motor proteins found in kinectrochore.
