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5 Cards in this Set
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- Back
Plasma membranes |
●found around cells and some organelles ● they are partially permeable barriers ●made up of phospholipids in a bilayer & proteins ●Under an electron microscope you can see the bilayer as 2 dark bands & the distance across the membrane is 7 nm |
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Fluid-Mosiac model |
The molecules in a membrane are not bonded together so there is some movement but it is relatively stable due to the nature of the phospholipid ●Singer & Nicholson proposed the model in 1972 Fluid: phospholipids and proteins move around each other Mosaic: Arrangement of proteins within the phospholipid bilayer |
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Plasma membrane Components |
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Role of membrane |
Within Cell: ●Separate cell components from cytoplasm (COMPARTMENTALISTION) ●Holding the components of metabolic pathways in place (eg mitochondria)
On surface ●Separate cell content from outside environment ●Cell recognition & signalling ●Regulating transport of materials into/out of cells |
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Temperature and Membrane |
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