Bacteria Notes 10/26

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Bacteria Notes 10/26

  1. 1. Bacteria <ul><li>Unicellular </li></ul><ul><li>Prokaryotic – no nuclear membrane; one circular chromosome </li></ul><ul><li>Ribosomes </li></ul>
  2. 2. Classification of Prokaryotes Humans and many animals Peptidoglycan Lacks peptidoglycan O 2 -free environments such as GI tracts and thick mud Bacteria Eubacteria Archeabacteria Harsh Environments Cell Wall Composition Cell Wall Composition Diverse Environments Soil Fresh and salt water Salty lakes Hot springs
  3. 3. Structure of Bacteria Flagella (some bacteria) DNA Pili Ribosome Peptidoglycan Cell Membrane Cell Wall
  4. 4. Shapes of Bacteria Bacilli (rod-shaped) Cocci (spherical) Spirilla (corkscrew)
  5. 5. Metabolic Diversity <ul><li>Energy Source </li></ul><ul><li>Heterotrophs get energy from other organisms </li></ul><ul><li>Autotrophs make their own food </li></ul><ul><ul><li>Photosynthetic </li></ul></ul><ul><ul><li>Chemosynthetic </li></ul></ul><ul><li>Respiration </li></ul><ul><li>Obligate aerobes requires O 2 </li></ul><ul><li>Obligate anaerobes w/o O 2 </li></ul><ul><li>Facultative anaerobes survive w/ or w/o O 2 </li></ul>
  6. 6. Binary Fission <ul><li>DNA replicates, and the cell divides in half </li></ul>
  7. 7. Conjugation <ul><li>Exchange genetic material across a hollow bridge </li></ul><ul><li>Increases genetic diversity </li></ul>
  8. 8. Spore Formation <ul><li>Under harsh conditions, an endospore may form to protect DNA </li></ul><ul><li>Spore stays dormant until conditions are favorable </li></ul>

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