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| All organisms consist of one or more... |
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| Smallest unit that still retains the charactristics of life |
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| since the time of life's origin, each new one is descended from one tat is already alive |
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| Many still use wave of light, and the wavelengths dictate their capacity to make imags. |
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| The distance from the peak of one wave to the peak behind it. |
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| Compound light microscopes Definition |
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| Two or more sets of glass lenses bend waves of light passing through a cell or some other spectrum. |
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| Photographs of images that emerge with the help of a microscope. |
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| Cells become visible when... |
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| they are thin enough for light to pass through them. |
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| nearly colorless and look uniformly dense. |
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| can stain cells nonuniformly and make their component parts show up, but stains kill cells |
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| dead cells break down fast --> |
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| most cells are preserved before staining |
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| the best light microscopes can enlarge cells... |
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| structures smaller than one one-half a wavelength of light are... |
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| too small to resolve, so they can not be distinguished. |
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| use magnetic lenses to bend and diffract beams of electrons, which cannot be diffracted through a glass lens. |
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| travel in wavelengths about 1,000 times shorter than those of visible light. |
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| can resolve details that are 100,000 times smaller than you can see with a light microscope. |
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| transmission electron microscopes |
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Definition
| electrons pass through a specimen and are used to make images of its internal details. |
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| scanning electron microscope |
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Definition
| direct a beam of electrons back and forth across a surface of a specimen, which has been given a thin metal coating. |
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| responds by emitting electrons and x-rays, which can be converted into an image of the surface. |
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