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Fluid Mosaic model The fluid mosaic model describes the structure of _____________________________________ and as the name suggests indicates that the cell membrane is not _________________________. (it has the consistency of olive oil). Functions of the plasma membrane: 1. ______________________ : Contains the contents of the cell 2. ______________________ : Regulates movement of substances in/out of the cell (selectively permeable) 3. _______________________: Allows cells to identify surrounding cells 4. _______________________: junctions and surfaces to attach to either ________________ or ____________________ ___ 5. _______________________: converts a mechanical or chemical stimulus to a cell into a specific cellular response 6. _______________________: Cells rely on thousands of different enzymes to allow metabolism. Structure of the cell membrane: A sandwich of hydrophobic with two slices of hydrophilic !! The components of the membrane are: _________________________ ____________________________________ _________________________ _____________________________________ Phospholipids: The major component of the cell membrane _______________________with a phosphate come together to make a fluid membrane Page 1 of 2 Fluid Mosaic Model A liposome is a small vesicle with an _______________________ compartment surrounded by a _____________________________. __________________________ bonds occur between the phosphate heads and keep the phospholipids together to make a cell membrane. Integral Proteins: Proteins surrounded by phospholipids which go through the membrane Functions: serve as ion ________________, _______________________________, or _______________________. Must have hydrophobic and hydrophilic regions Can be globular or membrane (other tertiary structures) Peripheral proteins: Proteins which attach to the membrane Predominately interact with _______________________________ Can attach by weak _________________________________ Glycoproteins GLYCOPROTEINS found on the _______________________ of the membrane Serve as recognition sites for chemicals Involved in cell to cell _______________________________ Glycolipids Between phospholipids Face extracellular fluid and serve as “cell identifiers” Cholesterol Involved in keeping membrane “fluid” Fluidity: The more fluid the membrane, the easier it is for a protein to change its conformation. Too much fluidity permits too many molecules to diffuse in and out of a cell. Factors affecting Fluidity: 1. Temperature: the bilayer becomes more fluid as temperature increases 2. Double bonds: double bonds form kinks in the tail, therefore increasing fluidity. 3. Fatty acid length: Longer fatty acids tails have more intermolecular attractions reducing fluidity Page 2 of 2 Fluid Mosaic Model