Microorganisms (not done yet :)!)

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  • Micro-organisms
    • Bacteria
      • Prokaryotae
        • do not possess membrane-bound nucleus
      • unicellular
        • colony
          • appear coloured
          • can be seen with naked eye
            • cannot be seen with naked eye
            • "Together we stand, divided we fall!"
      • cannot be seen with naked eye
      • food
        • environment
        • some can make their own food in the presence of sunlight
      • cell
        • chromosomal DNA
          • not enclosed within a nuclear membrane
            • coiled up to occupy part of cytoplasm
        • circular plasmids (DNA)
          • 'mature' DNA
          • can be used as vectors in genetic engineering
        • cell membrane
        • cell wall
          • NOT made of cellulose
          • made of a complex mixture of proteins, sugars and lipids.
            • Lipids: fats and oils
        • flagellum
          • propel the bacterial cell forward
        • slime capsule
          • gives cell a 'wet' look
      • respiration
        • aerobic
          • bacteria that need oxygen for their respiration
        • anaerobic
          • bacteria that do not need oxygen for their respiration
          • found deep in sea, soil
      • reproduction
        • cell division
          • binary fission
            • under 'favourable conditions'
              • nutrients
              • optimum temp
            • may occur very fast
  • often group together in
  • colony
    • appear coloured
    • can be seen with naked eye
      • "Together we stand, divided we fall!"

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