BIOL 1F90 Lecture Notes - Lecture 3: Cytosol, Active Transport, Carbohydrate
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12 Jan 2016
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Biol 1f90 chapter 6 lecture notes (membrane structure and transport) Framework of the membrane is the phospholipid bilayer. Phospholipids are amphipathic molecules (hydrophobic region faces in; hydrophilic region faces out) Membranes also contain proteins and carbohydrates (relative amount of each vary) Membrane is considered a mosaic lipid protein, and carbohydrate molecules. Membrane exhibits properties that resemble a fluid because lipids and proteins can move relative to each other within the membrane. Fluidity: individual molecules remain in close association yet have the ability to readily move within the membrane. Semifluid: most lipids can rotate freely around their long axes and move laterally within the membrane leaflet. Flipflop of lipids from one leaflet to the opposite leaflet doesn"t occur spontaneously (flippase requires atp to transport lipids from one leaflet to another) Length of fatty acyl tails (shorter acyl tails are less likely to interact, which makes the membrane more fluid)
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