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Bio notes FEb 8 - Biology 1010 CORRECTION A binds with T G...

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Biology 1010 8 February 2008 CORRECTION: A binds with T, G binds with C DNA/RNA transcription slide on eCompanion Chapter 4 General Descriptions of Cells Cell Theory 1. All living things are composed of one or more cells 2. Cells are the smallest units of living organisms 3. New cells come only from preexisting cells by cell division Microscopy Magnification Ratio between the size of an image produced by a microscope and its actual size Resolution Ability to observe Light microscope: uses light for illumination- resolution of .2 nm Electron microscope: Uses an electron beam- resolution of 2 nm Prokaryotic Cells Simple cell structure Lack a membrane-enclosed nucleus Two domains: bacteria and archaea
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Eukaryotic Cells DNA housed inside nucleus Eukaryotic cells exhibit compartmentalization Organelles: sub-cellular structures or membrane-bound compartments with their own unique structure and function Shape, size, and organization of cells vary considerably among eukaryotes
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