Biological membranes- fluid boundaries

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The roles of membranes: separating cell contents, cell recognition and signalling, holding components of some metabolic pathways in place, regulating the transport of materials into or out of cells.

The nature of phospholipids: hydrophilic head, hydrophobic tail. if phospholipid molecules are mixed with water, they form a layer at the water surface. the phosphate heads stick in the water, while the fatty acid tails stick up out of the water.

layers and bilayers: if phospholipids are completely surrounded by water a bilayer can form. phosphate heads of each side of the bilayer stick in the water, while the hydrophobic tails point towards each other in a sort of mirror image. In this state the bilayer can move freely…


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