3-1 looking at cells ppt
DESCRIPTION
This presentation correltates to section 3-1 of Holt Biology ed. 2004TRANSCRIPT
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Section 3-1
Heather Sullivan- FRHSDHeather Sullivan- FRHSD
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Describe 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
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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.
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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.
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Magnification Low Power (LP)= 40x MP=100x HP=400x
Micrograph Image seen
FOV Field of view
Benefits Specimen can still be alive Fairly inexpensive
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Pine Pollen 2000x
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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
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Hibiscus Pollen 200,000x
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