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Bacteria

Bacteria. Domains. Archaea - ancient prokaryotes Extremophiles Bacteria- cause disease today Peptidoglycan – sugars/ short polypeptides. Cell Shape. Cocci - spherical, rod shaped Clusters or chains Ex: Pneumonia bacteria Spirochetes - spiral shaped

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Bacteria

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  1. Bacteria

  2. Domains • Archaea- ancient prokaryotes • Extremophiles • Bacteria- cause disease today • Peptidoglycan – sugars/ short polypeptides

  3. Cell Shape • Cocci- spherical, rod shaped • Clusters or chains • Ex: Pneumonia bacteria • Spirochetes- spiral shaped • Ex: Syphilis and lyme disease bacteria • Bacilli- rod shaped • Ex: E.Coli

  4. Cocci

  5. Spirochetes

  6. Cell Wall • 2 types- determined by gram staining • Gram Positive - Peptidoglycan - Turns purple • Gram Negative - extra membrane - Turns pink

  7. Motility • Flagellum- Scattered over entire cell or concentrated on an end • Pili- shorter/thinner than flagella - Help bacteria stick to surfaces • Secretion of slimy threads- anchor bacteria to surfaces/ glide along slime

  8. Flagellum

  9. Pili

  10. Slime

  11. Reproduction • Binary Fission- DNA copies itself moves to opposite ends and cell splits • Colony of cells that are clones • http://www.youtube.com/watch?v=9leO28ydyfU&feature=PlayList&p=A520E31475B125CD&index=25&playnext=2&playnext_from=PL

  12. Modes of Nutrition

  13. Oxygen • Anaerobic- do not use oxygen • Aerobic- use oxygen • Cyanobacteria – first to generate oxygen as a by product • Caused earth to be aerobic

  14. http://www.youtube.com/watch?v=4lmwbBzClAc

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