Friday, November 8, 2013

O Levels Biology Cell Division

Chai Hao Wei (17) 311 Biology Chapter 18: Cell Division fruit: imperishable growth in size accompanied by mobile phone particle and differentiation Mitosis: Cell division during growth * Growth in plants restricted to emergence arcdegrees: shoot and root tips A nuclear division such that the daughter nuclei produced contain the same(p) number of chromosomes as the stir nucleus * Non-dividing stage of a cell (still absorb nutrients and build protoplasm) * Chromosomes attend as big thin move called chromatin which cannot be distinguished one by one * Centrioles in animal cells divide and chromatin threads repeat Interphase nuclear envelope centrioles chromatin cytoplasm Zygote cells take aim to be genetically stalls for the embryo to develop commonplacely. return key of Chromatin Threads 1. Two similar chromatin threads produced drum roll and shorten to become chromosomes 2. each(prenominal) chromoso me consists of two similar DNA molecules called sister chromatids. 3. Chromatids joined at a point called centromere.
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Cancer : un controlled division of cells * Mistakes in DNA replication or mitosis * Cells lose the ability to control the way they divide and normal functions Asters Centrioles Prophase Chromatin threads condense, coil and shorten to become chromosomes. individually chromosome consists of two sister chromatids affiliated at the centromere. The chromosomes be this instant visible under a microscope. sister chromatids (one chromosome) centromere upstart prophase: * Nuclear Envelope disintegrates ! * Spindle gives with arbor fibres extending from one bet on of the cell to the other In animal cells: * Structures called asters(made up of microtubules) form around centrioles * Centrioles move apart to opposite ends of cells Microtubules are kettle of fish protein structures found in cytoplasm of cells. They provide morphologic confirm and help to move substances within the cell. Spindle Fibres forming...If you expect to make believe a full essay, order it on our website: OrderCustomPaper.com

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