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Bacteria

Bacteria. Chapter 23. Bacteria. Microscopic prokaryotes Most numerous organisms on Earth Most ancient; earliest forms of life Bacteria are part of every environment on Earth Many are adapted to places where nothing else can live. Bacterial Evolution.

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Bacteria

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  1. Bacteria Chapter 23

  2. Bacteria • Microscopic prokaryotes • Most numerous organisms on Earth • Most ancient; earliest forms of life • Bacteria are part of every environment on Earth • Many are adapted to places where nothing else can live

  3. Bacterial Evolution • Rock deposits in Australia contain fossils of bacteria 3.5 byo; in relation: • 1st Eukaryotic cells (protists) 2.5 bya • Modern Humans only came about 100,000 years ago • So, all modern organisms evolved from bacteria

  4. Bacterial Classification • PROKARYOTIC: single-celled; no nucleus or membrane-bound organelles • Few morphological differences between types of bacteria • Do not vary much in shape & size like other organisms • Grouped into taxa based on structure, physiology, molecular composition, & reaction to specific types of stains

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