O Levels Biology Cell Division

Chai Hao Wei (17) 311 Biology Chapter 18: Cell Division developing: unchangeable growth in size accompanied by prison cell particle and differentiation Mitosis: Cell division during growth * Growth in plants restricted to emergence flowers: shoot and root tips A nuclear division such that the daughter nuclei produced contain the alike number of chromosomes as the stir nucleus * Non-dividing stage of a cell (still absorb nutrients and build protoplasm) * Chromosomes attend as coarse thin togs called chromatin which cannot be distinguished one after another * Centrioles in animal cells divide and chromatin threads recur Interphase nuclear envelope centrioles chromatin cytoplasm Zygote cells sine qua non to be genetically stalls for the embryo to develop figurely. return of Chromatin Threads 1. Two similar chromatin threads produced drum roll and shorten to become chromosomes 2. each(prenominal) chr omosome consists of two very(a) DNA molecules called sister chromatids. 3. Chromatids joined at a point called centromere.

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. severally chromosome consists of two sister chromatids affiliated at the centromere. The chromosomes be direct visible under a microscope. sister chromatids (one chromosome) centromere slow prophase: * Nuclear Envelope disintegrates * Spi! ndle hurls with arbor fibres extending from one terminus 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 cakehole protein structures found in cytoplasm of cells. They provide morphologic jut out and help to move substances within the cell. Spindle Fibres forming...If you expect to wash up a full essay, order it on our website: OrderCustomPaper.com

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