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3-1 Looking At Cells Ppt
 

3-1 Looking At Cells Ppt

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

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

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    3-1 Looking At Cells Ppt 3-1 Looking At Cells Ppt Presentation Transcript

    • Section 3-1 Heather Sullivan- FRHSD
      • 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
      • 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.
      • 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.
      • Magnification
        • Low Power (LP)= 40x
        • MP=100x
        • HP=400x
      • Micrograph
        • Image seen
      • FOV
        • Field of view
      • Benefits
        • Specimen can still be alive
        • Fairly inexpensive
    • Pine Pollen 2000x
      • Shoots a beam of electrons through a specimen to illuminate it
      • Must be in a vacuum so electrons don’t bounce off air molecules
      • Can’t study living cells
      • Benefits
        • Can study cell details & cell surface
        • Creates 3-D image
    • Hibiscus Pollen 200,000x
    •