Bacteria

• Unicellular


  Made of one cell
• Prokaryotes


  One of the 5 kingdoms of organisms that bacteria fall into
• Microorganisms


  Examples of which include bacteria
• Common examples of bacteria


  • Salmonella
  • Staphylococcus aureus
• Bacteria


  • Can cause diseases
  • Have practical uses
• Lactic acid bacteria


  Discovered by Louis Pasteur<|>Make lactic acid which causes a sour taste
• Lactic acid production


  Formed from glucose when bacteria respire anaerobically (without oxygen)
• Bacteria growth


  • Need nutrients, warmth and moisture
  • Grow faster when warmer due to enzymes
  • Moisture stops cells drying out
• Bacteria reproduction


  Asexual binary fission - one cell grows and splits evenly into two identical parts
• Using bacteria to make yoghurt and cheese

  Bacteria make lactic acid which thickens and sours the milk
• Bacterial cell organelles


  • Cell wall
  • Cell membrane
  • Cytoplasm
  • Flagellum
  • Circular chromosome
• Bacteria as prokaryotes


  • Lack a nucleus
  • Genetic information in circular chromosome
• Flagellum


  Used by bacteria to swim by spinning and propelling the cell forward
• Statement key


  Used to determine specific bacteria based on shape or size