Chapt.6 Membranes Transport

Chapt.6 Membranes Transport - Membranes and Transport BIO...

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Membranes and Transport BIO 2107K: BIOLOGICAL PRINCIPLES I
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The End of the Endomembrane System: The Plasma Membrane x Primary zone of contact between cell and its environment x Forms a barrier to keep things in or out x PM has mechanisms to allow passage of certain materials
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The Plasma Membrane x Membrane Structure x Passive Transport (Osmosis) x Active Transport x Exocytosis / Endocytosis
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Membrane Structure Biological membranes x consist of lipids and proteins assembled into a thin film x are composed of a phospholipid bilayer
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Polar (Hydrophilic) Nonpolar (Hydrophobic)
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Polar (outside cell) Polar (inside cell) Nonpolar (inside membrane)
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Hydrophobic tail Hydrophilic end Hydrophobic end Cholesterol in the lipid bilayer
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Membrane Proteins x Proteins are integrated into the lipid bilayer: integral proteins x These proteins have many functions x receptors x adhesion of one cell to another x transporting substances across the PM
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Outside cell Plasma membrane interior Inside cell
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Fluid Mosaic Model Fluid mosaic model video http://www.youtube.com/watch?v=Qqsf_UJcfBc x Membranes consist of a fluid phospholipid bilayer in which proteins are embedded and float freely x Fluid: membrane phospholipids move back and forth and switch places within the same bilayer x Mosaic: presence of proteins suspended within the bilayer
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Fluid Mosaic Model: Evidence Human cell Mouse cell Cell fusion
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x Integral membrane proteins –Embedded deeply in the bilayer –Can’t be removed without breaking up the bilayer x Peripheral membrane proteins –Associate with membrane surfaces Types of Membrane Proteins
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The primary function of cellular membranes is transport across the PM Transport : movement of ions and molecules from one side of the membrane to the other
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1. Passive Transport
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This note was uploaded on 03/06/2012 for the course BIOL 2107 taught by Professor J.louten during the Spring '10 term at SPSU.

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Chapt.6 Membranes Transport - Membranes and Transport BIO...

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