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Ch. 5 Summary - Chapter 5 Biological Membranes Evaluate the...

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Chapter 5: Biological Membranes Evaluate the importance of membranes to the homeostasis of the cell, emphasizing their  various functions: Biological membranes (1) physically separate the interior of the cell from the extracellular  environment and (2) form compartments within eukaryotic cells, allowing a variety of separate  functions. The  plasma membrane  regulates the passage of materials into and out of the cell, participates in  and serve as surfaces for biochemical reactions, receives information about changes in the  environment, and communicates with other cells. Describe the fluid mosaic model of cell membrane structure: According to the  fluid mosaic model , membranes consist of a fluid phospholipid bilayer in which  a variety of proteins are embedded. The phospholipid molecules are  amphipathic : They have hydrophobic and hydrophilic regions.  The hydrophilic heads of the phospholipids are at the two surfaces of the bilayer, and their  hydrophobic fatty acid chains are in the interior. Explain how the properties of the lipid bilayer govern many of the properties of a cell  membrane and of the cell: In almost all biological membranes, the lipids of the bilayer are in a fluid or liquid-crystalline state,  which allows the molecules to move rapidly in the plane of the membrane. Proteins move within  the membrane.
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