BIOL 1117 Lecture Notes - Lecture 8: Osmotic Concentration, Cholesterol, Cell Membrane
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2 Oct 2016
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Cell signaling, transport, etc. occur at cell surface. The plasma membrane is the unit membrane of the cell surface. Oily film defines the boundary of cell, two layers of phospholipids. Almost all of the molecules in the plasma membrane are lipid-based. The majority of the three types of lipids are phospholipids (by number) Phospholipids: amphiphilic: general movement is influenced by membrane fluid. Glycolipids: conjugated lipids: typically phospholipids, glycocalyx: carbohydrate coating on cell. By mass, half the membrane is due to proteins. Transmembrane proteins: have contact with hydrophilic and hydrophobic regions: goes all the way through, most of them are glycoproteins. Some proteins can shift freely within membrane, some are anchored to cytoskeleton. Peripheral: stick to one side of membrane, attached at least loosely to the cytoskeleton, ex: g protein. Passive: mechanism with no direct or immediate use of atp. Active: energy being used, large materials in vesicles.
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