membranes and transport

membranes and transport - Membranes and Transport(Keeping...

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Membranes and Transport (Keeping the in in and the out out)
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Lipid Aggregation Like dissolves like Polar part interacts with water Head groups Cholines, phosphates, serines etc Nonpolar parts stay away from water Fatty acid tails Form micelles or bilayers
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Lipid Structures In water
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Fluid Mosaic Model of Cell Membranes
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Fluid Mosaic Model of Cell Membranes Membrane mostly lipid PC, PS, PE etc Also glycolipids Cerebrosides and gangliosides Protein scattered throughout Integral Peripheral Specifics depend on membrane Proteins in a lipid ocean 2D diffusion
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Membranes Assymetrical Lipids Inner v outer leaf Large barrier to transfer between leaves In general smaller on inner leaf Inner leaf less roomy Gangliosides on outer Proteins Different in different leaves Different roles
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Transport across the membrane Moving particles Diffusion Simple Facilitated Active Transport Endocytosis Receptor mediated endocytosis Moving information Signal transduction
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Diffusion With concentration gradient Swimming downstream Simple Molecules moving with gradient Osmosis Uniport Symport antiport Facilitated Uses carrier Carnitine example
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Active Transport Requires Energy in the form of ATP Against concentration gradient Example: Na + /K + pump Enzyme is Na+-K+-ATPase 3 Na + ions move in 2 K + ions move out
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Active Transport
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membranes and transport - Membranes and Transport(Keeping...

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