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MEMBRANES (FLUID MOSAIC MODEL (spanning the membranes are various proteins…
MEMBRANES
FLUID MOSAIC MODEL
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eukaryotic cell membranes contain cholesterol, which is important for helping to regulate the fluidity of the membrane, maintain mechanical stability and resist the effects of temperature changes on the structure of the membrane
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PARTIALLY PERMEABLE
some very small molecules simply diffuse through the cell membrane, in between its structural molecules
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ROLES OF MEMBRANES
plasma membrane
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has antigens, so that the organism's immune system can recognise the cell as being self and not attack it
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contain receptors for such chemical signals, and so is a site for cell communication or signalling; hormones and drugs may bind to membrane-bound receptors
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bulk transport secretion of proteins e.g. hormones, enzymes
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WITHIN CELLS
membranes around many organelles present in eukaryotic cells separate the organelle contents from the cell cytoplasm, so that each organelle is a discrete entity and able to perform its function. In some organelles, metabolic processes occur on membranes.
mitochondria have folded inner membranes, cristae
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inner membranes of chloroplasts, thylakoid membranes, house chlorophyll
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there are some digestive enzymes on the plasma membrane of epithelial cells that line the small intestine
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