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Understanding the basic structure of a cell Cells Structure All cells have organelles; these are the specialised structures within a cell that help it to perform the specific functions. Organelle Structure / Function Cell Membrane The cell membrane keeps the cell together by containing the organelles within it. Cell membranes are selectively-permeable, allowing materials to move both into and outside of the cell. Centrosomes also known as the MTOC is where the microtubules are produced During cell division the centrioles replicate and the centrosome divides. The result is two centrosomes, each with its own pair of centrioles. The two centrosomes move to opposite ends of the nucleus, and from each centrosome, microtubules grow into a "spindle" which is responsible for separating replicated chromosomes into the two daughter cells. Centriole A ring of nine groups of microtubules, each group has three microtubules (centriole), and is part of the cytoskeleton Cytoplasm Cytoplasm is a jelly-like substance that is sometimes described as "the cell-matrix"....

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