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7.1 Cell Intro
 

7.1 Cell Intro

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7.1 Cell Intro 7.1 Cell Intro Presentation Transcript

  • Chapter 7.1 Cells Image credit: Sibi on Flickr http://www.flickr.com/photos/beebee/200316216/in/set-72057594081382862 /
  • Goal 1: Explain the Cell theory and its evolution
    • Cell Theory
      • All living things composed of cells
      • Cells are the basic units of structure and function in living things
      • New cells are produced from existing cells
    • Robert Hooke 1665
      • Microscope
      • First to observe cells
    Image credit: PD-gov http://en.wikipedia.org/wiki/Image:Hooke_Microscope-03000276-FIG-4.jpg
  • Image credit: Martin LaBar on Flickr http://www.flickr.com/photos/martinlabar/66177481/
    • Anton van Leeuwenhoek 1674
      • Single-celled Protista
    Image credit: Dr. Ralf Wagner on wikipedia commons http://en.wikipedia.org/wiki/Image:Chaos_diffluens.jpg
    • Matthias Schleiden 1838
      • All plants are made up of cells
    Image credit: PD-personal http://en.wikipedia.org/wiki/Image:Matthias_Jacob_Schleiden.jpg
    • Theodore Schwann 1839
      • Animals are made up of cells
    Image credit: PD-old http://en.wikipedia.org/wiki/Image:Schwann_Theodore.jpg
    • Rudolph Virchow 1855
      • New cells from division of existing cells
    Image credit: PD-old http://en.wikipedia.org/wiki/Image:Rudolf_Virchow_by_Hugo_Vogel,_1861.JPG Image credit: PD-old http://en.wikipedia.org/wiki/Image:Telophase.jpg
    • Cell Theory
      • All living things composed of cells
      • Cells are the basic units of structure and function in living things
      • New cells are produced from existing cells
  • Goal 2: Discuss how researchers explore the living cell
    • Modern light microscopes
      • Fluorescent “labels”
      • Molecules
  • Image credit: PD-gov http://en.wikipedia.org/wiki/Image:FluorescentCells.jpg
    • Confocal light microscopes
      • lasers
      • High resolution
      • 3-D images
  • Image credit: Pawel Jasnos http://en.wikipedia.org/wiki/Image:Tetrachimena_Beta_Tubulin.png Tubulin protein marked in Tetrachimena sp.
    • High resolution video
      • Movies of cell activities
    Image credit: PD-gov http://physics.nist.gov/Divisions/Div842/Gp4/Tweezers/Images/Liposomefusion.jpg Video of liposome fusion
    • Transmission Electron Microscopy (TEM)
      • Beams of electrons are passed through a thin slice of an object
      • Objects too small for light microscopes
  • Image credit: PD-personal by Allonweiner http://en.wikipedia.org/wiki/Image:Bacillus_subtilis.jpg TEM image of Bacterium Bacillus subtilis
    • Scanning Electron Microscopy (SEM)
      • Beams of electrons scanned over surface of an object
      • 3-D images
  • Image credit: PD-personal by Dartmouth Electron Microscope Facility http://en.wikipedia.org/wiki/Image:Misc_pollen.jpg Pollen Grains
    • Scanning Probe Microscopy (SPM)
      • Scans objects with probe
      • 3-D image
      • Open air with samples in solution
      • Probes are needles with a tip of one atom (wow! That’s small!)
  • Goal 3: Distinguish between eukaryotes and prokaryotes
    • Characteristics of ALL cells
      • Surrounded by a cell membrane
      • Genetic information in the form of DNA
    Image credit: Ah Pao on Flickr http://www.flickr.com/photos/ah_pao/2590858936/
    • Prokaryotes
      • No nucleus
      • Simple
      • Small
      • Single cell organisms
      • Bacteria
    Image credit: Nutloaf on Flickr http://flickr.com/photos/83371410@N00/1644090403 Salomonella bacteria invades a human cell
  • Image credit: PD-personal LadyofHats on wikipedia http://commons.wikimedia.org/wiki/Image:Prokaryote_cell_(temp_PNG).png
    • Eukaryotes
      • Contain nucleus!!
      • Complex, organelles
      • Large
      • Single-celled or multi-cellular
  • Image credit: PD-personal LadyofHats on wikipedia http://commons.wikimedia.org/wiki/Image:Animal_cell_structure_en.svg
  • Image credit: Wenche Eikrem and Jahn Throndsen http://en.wikipedia.org/wiki/Image:Ostreococcus_RCC143.jpg