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The Cell

Theory and Membrane. The Cell. Cell Theory. First recorded view by Robert Hooke in 1665 Cork structures look like monks' cells. Cell Theory. First recorded view by Robert Hooke in 1665 Antonie van Leeuwenhoek viewed living cells in 1674

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The Cell

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  1. Theory and Membrane The Cell

  2. Cell Theory • First recorded view by Robert Hooke in 1665 • Cork structures look like monks' cells

  3. Cell Theory • First recorded view by Robert Hooke in 1665 • Antonie van Leeuwenhoek viewed living cells in 1674 • Named moving objects in pond water animalcules (little animals)‏

  4. Cell Theory • First recorded view by Robert Hooke in 1665 • Antonie van Leeuwenhoek viewed living cells in 1674 • Henri Dutrochet—1837 • “The cell is the fundamental element of organization.”

  5. Cell Theory • First recorded view by Robert Hooke in 1665 • Antonie van Leeuwenhoek viewed living cells in 1674 • Henri Dutrochet—1837 • Matthias Schleiden—1837 • All plants are composed of cells that come from other plant cells

  6. Cell Theory • First recorded view by Robert Hooke in 1665 • Antonie van Leeuwenhoek viewed living cells in 1674 • Henri Dutrochet—1837 • Matthias Schleiden—1837 • Theodor Schwann—1838 • Animals have cells and those come from other animal cells

  7. Cell Theory • First recorded view by Robert Hooke in 1665 • Antonie van Leeuwenhoek viewed living cells in 1674 • Henri Dutrochet—1837 • Matthias Schleiden—1837 • Theodor Schwann—1838 • Rudolf Virchow—1858 • Cells come from pre-existing cells (refutes spontaneous generation)‏

  8. All Cells • Cell membrane

  9. All Cells • Cell membrane • Cytoplasm

  10. All Cells • Cell membrane • Cytoplasm • Usually live in fluid environment

  11. Plasma Membrane • Also called cell membrane • Controls what goes into and comes out of cell • Selectively permeable

  12. Plasma Membrane • Lipid bilayer made of phospholipids • Phosphate portion is attracted to water, while tails of fatty acid are repelled by water

  13. Plasma Membrane • Proteins extend through structure to enable transport • Glycolipids and cholesterols help maintain shape and function

  14. Fluid Mosaic Model • Proposed by S. J. Singer and Garth Nicolson • Proteins are free to move around in fluid phospholipid layer

  15. Other Membranes • Internal cell structures (organelles)‏ • Membrane composition and structure differs slightly for organelles • Function depends on structure

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