3-1 Looking At Cells Ppt

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

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3-1 Looking At Cells Ppt

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

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