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BIOL 1107 (23)
Chapter 7

Biology Chapter 7 Notes.docx

5 Pages

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BIOL 1107
Armstrong, Norris

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Biology1107 Chapter 7 NotesMembrane Structure and FunctionOverview1The plasma membrane is the boundary that separates the living cell from its surroundings2The plasma membrane exhibits selective permeability allowing some substances to cross more easily than others 71 Cellular membranes are fluid mosaics of lipids and proteins1Lipids and proteins are the main ingredients of membranescarbs are also important 2Phospholipids are the most abundant lipids in the plasma membrane3A phospholipid is an amphipathic molecules meaning it has both a hydrophilic region and a hydrophobic region most proteins within membranes have both hydrophobic and hydrophilic regions as wellaHydrophobic regionbHydrophilic region4How are phospholipids and proteins arranged in the membranes of cellsaFluid mosaic model states that a membrane is a fluid structure with a mosaic of various proteins embedded in it or attached to a double layer bilayer of phospholipidsMembrane Models Scientific Inquiry1Membranes have been chemically analyzed and found to be made of proteins and lipids2Scientists studying the plasma membrane reasoned that it must be a phospholipid bilayeraSuch a double layer of molecules could exist as a stable boundary between two aqueous compartments because the molecular arrangement shelters the hydrophobic tails of the phospholipids from water while exposing the hydrophilic heads to water 3Hugh Davson and JAMES Daniello proposed a sandwich model in which the phospholipid bilayer lies between two layers of globular proteins aHad problems 1 Inspections of a variety of membranes revealed that membranes with different functions differ in structure and chemical compositions 2 Membrane
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