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Membrane Lipid = Phospholipid
YOU REMEMBER THE PHOSPHOLIPID RIGHT? Polar Head Two Nonpolar Tails
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Let’s take another look:
HYDROPHILIC – loves water HYDROPHOBIC – fears water
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A Bilayer!!!! HYDROPHILIC HYDROPHOBIC HYDROPHILIC Phospholipid Bilayer – two rows of phospholipids that surround every cell.
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Put It All Together Remember: The membrane is made of 3 major molecules, not only LIPIDS!
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“Fluid Mosaic” Model
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One difference is the membrane lipids!
Unlike other organisms, archean cells use ether linked (-OH : -OH) lipids in their membranes. Also, the “tails” are funky. Take home: archea have weird membrane lipids
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Different membranes for different environments
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Membrane fingerprints
Long chains are more like butter (for high temps) Short chains are like oil (cold temps)
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The wonderful world of lipid chemistry
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The Basics are as easy as 1. hydrophilic heads 2. hydrophobic tails 3
The Basics are as easy as 1. hydrophilic heads 2. hydrophobic tails 3. phospholipid bilayer!
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Wrap Up Cell membrane structure: phospholipid bilayer
Cell membrane function: selective permeability controls what enters / exits cell Time for a video? Inner Life of A Cell Harvard U BioVisions computer modeling lab.
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