Cells1 - Lecture Objectives: tobetter...

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Lecture Objectives: -to better  understand cell  metabolism  - the set of  reactions in an organism that  collectively… 1. allow cells to transport molecules in and out of their  membrane boundaries 2. allow cells to respond to changes in their external  environment 3. allow cells to use genetic information to build large  molecules for structure and function  4. allow cells to move and target molecules through their  interior volume  5. allow cells to utilize and transform energy for all of the  above
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Cells in all three domains of life share certain characteristics Membrane  - a fluid, mosaic, selectively permeable barrier  allowing flow inside and outside of the cell  INSIDE OUTSIDE Figure 1.7 phospholipids proteins Membranes: 1. Serve as barrier  2. Control flow 3. Receive signals 4. Transmit signals
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Adapatation: What Controls Membrane Fluidity under changing conditions? Hybernating Wood Frog Video interlude (Inner Life of the Cell) QuickTimeª and a TIFF (Uncompressed) de are needed to see this p Saturated fatty acids more solid (warm) Unsaturated fatty acids more liquid (cold) Cholesterol (animals)
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How do molecules get in/out of cells? Diffusion  random motion of particles that  causes them to spread in a time- dependent manner Gradient-  spatial variation in  concentration of a chemical or charge  that leads to a net flow Diffusion through cell membranes  favors: Small > Big Uncharged > Charged Non-polar > Polar
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Passive transport - flow down a gradient through for impermeable molecules thru… 1. Channels (pores)  - proteins that allow big, polar or charged  substances across membrane through an open passage  through the membrane 2. Carriers 
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This note was uploaded on 05/23/2011 for the course BIO 101 taught by Professor Lanno during the Spring '08 term at Ohio State.

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Cells1 - Lecture Objectives: tobetter...

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