3-1 looking at cells ppt

Download 3-1 Looking At Cells Ppt

Post on 05-Dec-2014

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This presentation correltates to section 3-1 of Holt Biology ed. 2004

TRANSCRIPT

  • 1. Section 3-1 Heather Sullivan- FRHSD
  • 2.
    • Describ e how scientists measure the length of objects.
    • Relate Magnification & Resolution in the use of microscopes
    • Analyze how a light microscope functions
    • Compare a Light Microscope with an Electron Microscope
  • 3.
    • Measuring Cell Structures
      • Scientists use the metric system to measure the sizes of objects viewed under a microscope.
    • Characteristics of Microscopes
      • enable biologists to examine the details of cell structure and to understand how organisms function. Magnification and resolution are two quantitative characteristics of microscopes.
  • 4.
    • Compound Light Microscope
      • Light microscopes have a low magnification and can be used to examine living cells.
    • Electron Microscopes
      • Electron microscopes have a high magnification but cannot be used to examine living cells.
    • Scanning Tunneling Microscope
      • The scanning tunneling microscope uses a computer to generate a three-dimensional image of the object.
  • 5.
    • Magnification
      • Low Power (LP)= 40x
      • MP=100x
      • HP=400x
    • Micrograph
      • Image seen
    • FOV
      • Field of view
    • Benefits
      • Specimen can still be alive
      • Fairly inexpensive
  • 6. Pine Pollen 2000x
  • 7.
    • Shoots a beam of electrons through a specimen to illuminate it
    • Must be in a vacuum so electrons dont bounce off air molecules
    • Cant study living cells
    • Benefits
      • Can study cell details & cell surface
      • Creates 3-D image
  • 8. Hibiscus Pollen 200,000x
  • 9.

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