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Membrane - Membranes All life occurs in on or across...

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Membranes Membranes All life occurs in, on or across membranes 7 - 9 nm thick
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Plasma Membrane Plasma Membrane The plasma membrane is common to all cells Separates: ICF from ECF Phospholipid bilayer : External surface lined with hydrophilic polar heads Cytoplasmic surface lined with hydrophilic polar heads Nonpolar, hydrophobic, fatty-acid tails in between
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Fluid Mosaic Model Fluid Mosaic Model Three components: Basic membrane referred to as phospholipid bilayer Protein molecules - move laterally Cholesterol
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Functions of Membrane Proteins Channel Proteins: Carrier Proteins: Cell Recognition Proteins: Receptor Proteins: Enzymatic Proteins: channel carrier Cell recognition receptor enzyme
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Types of Transport Types of Transport Plasma membrane is differentially (selectively) permeable Passive Transport Active Transport
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Types of Membrane Transport Types of Membrane Transport
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Diffusion Diffusion Solution = Solvent (liquid) + Solute (dissolved solid) Diffusion = Net movement of solute molecules down a concentration gradient Equilibrium :
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