BSCI 105 Chapter Notes - Chapter 7: Lipid Bilayer, Cell Membrane, Extracellular Fluid
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31 Jan 2016
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Plasma membrane- boundary that separates the living cell from its surroundings. Membrane proteins reside in the phospholipid bilayer with the. Controls traffic into and out of cell by selective permeability allows. Asymmetrical arrangement of proteins, lipids, and carbohydrates in plasma membrane is determined as membrane is being built by er and golgi apparatus. Fluidity of membrane- should be fluid to work properly. Held together by hydrophobic interactions- weak bonds. Lipids can pass each other in the line- like someone pushing through a crowd- super quick- 107 times per second. Proteins seem to be immobile attached to cytoskeleton or ecm except. Membrane is fluid until temperature decreases and phospholipids and rich in phospholipids- needs lower temp/harder to solidify. When membrane solidifies- permeability change and enzymatic proteins in membrane can become inactive if activity requires them to move within membrane, but too fluid, then can"t support protein function. membrane.
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