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CH 7 Membrane structure & function

CH 7 Membrane structure & function - Membrane...

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Membrane Structure & Function
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Membrane Structure & Function Fluid mosaics of lipids and proteins Selectively permeable Transport mechanism Passive transport (uses Diffusion) Active transport (uses Energy) Bulk transport (endo- and exocytosis)
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Phospholipid bilayer Fluid mosaic model Hydrophobic core Hydrophilic exterior Maintains Interior (cytoplasm) Exterior (extracellular space)
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Membrane Structure & Function Fluid mosaics of lipids and proteins Selectively permeable Transport mechanism Passive transport (uses Diffusion) Active transport (uses Energy) Bulk transport (endo- and exocytosis)
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Fluidity Factors What makes lipids liquid at room temperature? Cis double bonds Causes kink in chain Increases spacing More movement More fluid Cholesterol? Warm – less movement; less fluid Cold – increases spacing, more fluid
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Fluid Mosaic Model
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Embedded Proteins Hydrophilic portions of proteins extend into aqueous areas Hydrophobic portions are embedded in the interior of the bilayer that is also ________.
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Making more membrane Membrane or secreted proteins (made in ER)
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