Biology 1202B Lecture Notes - Lecture 1: Cell Membrane, Osmosis, Alpha Helix

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Membranes in animals structurally different depending on the embedded proteins. Membranes are selectively permeable so it keeps some things in and some things out. Barrier to water-soluble molecules, the internal and external environments are both aqueous (makes the cell self-contained this is necessary for life to control the environment). Phospholipids embedded in the membrane like transporting, anchoring, signalling. Amphipathic molecules 1 end is hydrophilic, 1 end is hydrophobic (one polar. Phospholipids all have two fatty acid tails and glycerol and fatty acid attached to. The nonpolar fatty acid tails like to associate with each other away from water. The polar heads like to interact with water the head. Saturation means all the carbons are bound to max number of h. Unsaturated have double bonds incorporated, this forms a kink. Phospholipid self assemble always in motion, they occur because the structure is the lowest energy structure. Hydrophobic tails migrate into the center while hydrophilic stay on the outside.

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