ch11 - 3/23/2011 1 Membranes and Transport Chapter 11 What...

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Unformatted text preview: 3/23/2011 1 Membranes and Transport Chapter 11 What does it take for a cell to be alive? Integrity of compartment Energy flow Respond to environment Reproduce itself Lipid Bilayer 3/23/2011 2 2 x 15 = 30 ~20-30 Total thickness ~50-60 (5-6 nm) Bilayer is asymmetrical: lipid asymmetry 11-5 PE PS 3/23/2011 3 Bilayer is a two-dimensional fluid 11-16 Why is this slow compared with lateral diffusion? Very difficult to pass hydrophilic head group through hydrophobic interior of bilayer 11-16 3/23/2011 4 How do you think these enzymes work? Probably provides a hydrophilic path for the head group through hydrophobic interior of bilayer 11-16 11-15 Low temp High temp 3/23/2011 5 Membrane proteins Basic structure of membranes determined by lipids, but specific function of membranes determined by protein components. Proteins are held in place by hydrophobic interactions with lipids Anchored 11-6 3/23/2011 6 11-8 Integral membrane proteins glycophorin 11-7...
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ch11 - 3/23/2011 1 Membranes and Transport Chapter 11 What...

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