CHAPTER FIVE - CHAPTER FIVE- Cellular Membranes Bilayered...

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CHAPTER FIVE- Cellular Membranes Bilayered Dynamic-membranes continuously form, continuously move & fuse with other membranes. Each organelle is modified with its own membrane so it can carry out a specific function. Membrane though as a fluid mosaic model, proteins can move within the fluid in the membrane, move side to side-lateral movement. Functions of membrane: Process information can receive a signal Energy transformation (one form to another) Regulate the movement of molecules, enter or exit the cell (selectively permeable) Lipid Component: acts as a barrier for water soluble molecules, major lipid = phospholipids. Cholesterol: helps increase or decrease the fluidity of the membrane. Fatty Acids: C=C=C: double bonds-more fluidity. C-C-C: single bonds-more rigid. The saturated fatty acid-all single bond, less fluidity= more rigid (animal fat). The unsaturated fatty acid-at least one double bond, fluidity (oil). Proteins: Ratio: protein to phospholipids will depend on the function of the membrane. Ex). Lots of metabolic activity = lots of proteins! Hydrophobic and/or hydrophilic region depending on the protein.
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Types: Intergral membrane protein - will have hydrophobic region, region that will enter or
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This note was uploaded on 09/13/2009 for the course BIO 120 taught by Professor Ander... during the Fall '08 term at Detroit Mercy.

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CHAPTER FIVE - CHAPTER FIVE- Cellular Membranes Bilayered...

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