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CellTheory - Cell Theory What characteristic of cells must...

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Cell Theory
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What characteristic of cells must have come first? 1) reproduction 2) catalysis 3) response to environmental changes (homeostasis) 4) energy metabolism 5) growth 6) evolution/natural selection
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Cell Theory ! Cells are the simplest bits of living material, i.e. of material that has all the characteristics of life ! All organisms are cells, are composed of cells, or can be subdivided into cells ! All cells come from pre-existing cells ! most cells are too small to see (50 micrometers, ! m, 10 -6 meters in diameter)
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Light Microscopy The objective lens gives a real image.
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Light Microscopy The ocular lens gives a virtual image.
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A light microscope combines an ocular lens, an objective lens, and often several inter- mediate lenses. Total magnification is the product of magnification by each lens and can be up to 1000X.
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Light microscopy Advantages : Simple; can be used for live, functioning cells (though not at 1000x) Disadvantages : Resolution limited by (a) thick subjects ; light-scattering , (b) lack of contrast ,
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