01:119:115 Lecture Notes - Lecture 6: Cytoskeleton, Hydrophile, Signal Transduction
22 Nov 2015
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Document Summary
Phospholipids- main component of membrane: amphipathic- hydrophilic heads and hydrophobic tails, hydrophobic tails form bilayer. Fluid-mosaic model: fluid structure + mosaic of various proteins, fluidity. Proteins in membrane form pattern (tiles in a mosaic) Carbohydrates: glycoproteins - attached to proteins, glycolipids - attached to lipids. Dissolves and cross through the lipid bilayer: hydrophilic molecules (ions and polar molecule) Do not dissolve and cross the membrane easily. Selectively permeable - regulates movement of molecule in and out of the cell. 2: allows the passage of hydrophilic substances, channel proteins (hydrophilic tunnel) Aquaporin - specific for water: carrier protein (needs atp) Including h2o (b/c it is small enough: osmosis - diffusion of h2o across selective permeable membrane, water from low to high solute [ ] b, water balance of cells without walls. From high to low [ ] of h2o movement) Tonicity - ability of solution to cause cell to gain or lose h2o.
