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14 Cards in this Set
- Front
- Back
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what does the compound light microscope do? |
it reflects light through a set of lenses and the specimen to magnify the specimen |
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advantages of the compound light microscope
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- only type that can examine living organisms - cheap - easy to use |
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disadvantages of the compound light microscope |
- limited magnification' - cannot show too many details of cells |
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two important characteristics that determine the quality of a light microscope |
- magnification - resolution |
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what is magnification? |
an increase in the apparent size of an object |
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how do you calculate magnification? |
magnification of eyepiece x magnification of objective = total magnifying power |
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what is resolution? |
the measure of clarity of an image. as the magnification increases, the resolution of the image decreases |
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electron microscope |
use beams of electrons for magnification |
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types of electron microscopes |
- scanning electron microscope (SEM) - transmission electron microscope (TEM) |
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what is a scanning electron microscope? |
used to study the detailed architecture of the surface of the object. forms a 3D image, but does not show the inside of the object |
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what is a transmission electron microscope? |
used to provide a detailed 2D image of the inside structure of the object that's viewed |
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what is the cell theory? |
- all living organisms are made up of cells - cells are the basic structure and function of living organisms - all cells come from cells that existed before them by cellular reproduction |
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who created the basics of the cell theory? |
schwann, schleiden, and virchow |
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every cell has the following main characteristics: |
- plasma membrane covering - their genes are made of DNA |
