ch04_lecture - CellStructureandFunction Chapter4 CellTheory*

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Cell Structure and Function Chapter 4
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Cell Theory * 1) Every organism is composed of one or  more cells 2) Cell is smallest unit having properties of  life 3) Continuity of life arises from growth and  division of single cells
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Cell * Smallest unit of life Can survive on its own or has potential to  do so Is highly organized for metabolism Senses and responds to environment Has potential to reproduce
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Structure of Cells * All start out life with: Plasma membrane   Region where DNA  is stored Cytoplasm   Two types: Prokaryotic Eukaryotic
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Lipid Bilayer * Main component of  cell membranes Gives the  membrane its fluid  properties Two layers of  phospholipids
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Fluid Mosaic Model * Membrane is a mosaic of Phospholipids Glycolipids Sterols Proteins Most phospholipids and some proteins can  drift through membrane
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Membrane Proteins* Transport proteins  Receptor proteins  Recognition proteins  Adhesion proteins 
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Why Are Cells So Small?* Surface-to-volume ratio The bigger a cell is, the less surface area  there is per unit volume Above a certain size, material cannot be  moved in or out  of cell fast enough
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Microscopes* Create detailed images of something that  is otherwise too small to see Light microscopes Simple or compound Electron microscopes Transmission EM or Scanning EM
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ch04_lecture - CellStructureandFunction Chapter4 CellTheory*

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