In class notes for September 17, 2007

In class notes for September 17, 2007 - Introduction to...

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Introduction to Biological Sciences 110a In class notes for September 17, 2007 Discussion today at 5:10pm on Protein Structure Help session tomorrow at 4:10pm Cells use unsaturated fatty acids in their membranes to regulate fluidity Red blood cells o An example of a plasma membrane o Contain many integral protein molecules o On slide, inter surface is facing up o Integral proteins help ions cross the membrane o The anion channel exchanges one anion for another. This is how our cells get rid of carbon dioxide. o There is a network of peripherial proteins that connects to cytoplasmic (? Word) Strengthen cells Read on pgs.144-146 Look for general impression, not detail Membrane transport o If a molecule needs to cross a membrane What is the concentration on each side? High to low- easy Low to high- needs energy Does the molecule fit through membrane? o Back to energy Passive transport, does not need energy Moves from high to low, no energy Simple diffusion o When molecule can go through lipid bilayer without any help Usually small hydrophobic molecules Since interior is hydrophobic, they don’t have problems
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Introduction to Biological Sciences 110a In class notes for September 17, 2007 Membranes don’t like big molecules, charged molecules, or any polar molecules. The speed of crossing Glucose is twice as big as glycerol, so it crosses 100 times slower Indole is the side chain of trytophane is an aminoacid, high hydrophobicity, Indole takes a lot less time than trytophane. For biological purposes, salt doesn’t cross membrane
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This note was uploaded on 02/22/2009 for the course BSCI 110A taught by Professor Broadie/patton during the Fall '08 term at Vanderbilt.

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In class notes for September 17, 2007 - Introduction to...

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