NED notes 9 - NED notes 10 Bacteria Prokaryote-a living...

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NED notes 10 2/28/08 Bacteria Prokaryote—a living cell No nucleus, no “complex” organelles DNA—collected in one region of the cell, but no membrane Can form associations with other cells (same type or different types) called biofilms Provide protection, safe environment, but cells do not differentiate—take on different jobs Can form complex layers Comparison to viruses Living vs. nonliving Metabolism—they can create structures, carry out independent reactions, fight eukaryotic cells Viruses must rely on cellular processes Our cells “confront” bacteria as they enter—looking for a nice place to live—avoid digestion/destruction “confront” viruses as they leave—few enter, many leave Two different branches of the immune system operate inside cells Ways to identify bacteria 1. Microscope Shape—major method of classification Rod--bacter Spherical—coccus Spiral—Spirillum We now know that bacteria have cytoskeletons, though not as elaborate as eukaryotes. This allows them to change shape.
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