In class notes for September 12, 2007

In class notes for September 12, 2007 - Introduction of...

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Introduction of Biological Sciences 110a In class notes for September 12, 2007 This is the first of three lectures on membranes. Life is organization, so membranes are the organizers Every cell is surrounded by a membrane Eukaryotic has even more membranes within Membranes could have been involved in starting life somehow RNA is very versatile Membrane molecules are very simple and spontaneously form closed compartments Membranes o Do three things Compartmentalize (divide the cell into compartments) They separate the parts of the cell They localize particular molecules o Some enzymes need to work together, this allows them to be physically close to each other o Like blood clotting (only need to clot in the right place) They filter molecules (good in, bad out) Proteins are almost always different on one side of the membrane than the other (different concentration on each side) Store energy Concentration gradient (concentration is different on one side of the membrane than the other) o This is a way of storing energy It takes energy to store molecules in one place so it releases energy when the molecules can go back again (this is called chemical potential, think of hydroelectric power) Consequent Functions Means they are a consequence of having membranes If you have walls in a house, the consequence is you have to have doors o One consequence is transport
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Introduction of Biological Sciences 110a In class notes for September 12, 2007 The machinery for transport is embedded in the membrane. o
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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 12, 2007 - Introduction of...

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