Word Count : 250

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The fluid mosaic model explains the structure of biological membranes as a dynamic and flexible arrangement of lipids and proteins. Proposed by Singer and Nicolson in 1972, the model describes the plasma membrane as a phospholipid bilayer where the hydrophilic heads face the aqueous environment and the hydrophobic tails are oriented inward, forming a stable barrier. This bilayer provides the fundamental structural ________ ________ _______ _________ ______ __________ ________ _____ ___.
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