BIOL 112 Study Guide - Final Guide: Fluid Mosaic Model, Lipid Bilayer, Extracellular Fluid
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BIOL 112 Full Course Notes
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Biology 112 exam study guide: chapter 7 cell membrane structure and transport. Cell membrane: composition: mostly made of lipids and proteins. Separates the intracellular matrix from the extracellular matrix. Controls traffic in and out of the cell: fluid mosaic model: Accepted model of molecule arrangement in plasma membrane. Mosaic of protein molecules bobbing" in a fluid bilayer of phospholipids. Helps explain how membranes regulate the cell"s molecular traffic (functions, transport, etc. ) : some parts of the membrane can move around freely if they are not attached to other parts of the cell: mosaic. Membranes are held together mainly by hydrophobic interactions. The membrane remains fluid until temperature decreases and phospholipids settle into closely packed arrangement, causing the membrane to solidify. Fluidity is also influenced by its type of lipids: integral proteins: embedded into lipid bilayer (penetrate hydrophobic region) Peripheral proteins: not embedded, loosely bound to membrane surface: integral proteins. Receptor: response of cell to chemical stimuli.