gram bacteria

• Gram positive bacteria


  • Bacillus
  • Streptococcus
• What allows the stain to bind effectively to the Gram Positive bacteria

  The absence of an outer lipopolysaccharide layer
• Lysozyme


  Hydrolyses the bonds holding the peptidoglycan molecules together in the bacterial walls
• Penicillin


  Prevents the bonds inter-linking peptidoglycan molecules from forming, making the cell walls structurally weak
• Water uptake by osmosis


  Can burst the cell when the cell walls are weak
• What colour do Gram negative bacteria turn after staining when looking under a microscope

  Red or pink
• Lipopolysaccharide


  Gram negative bacteria have this in their cell wall which Gram positive bacteria don't
• What does the Lipopolysaccharide layer do


  Protects the cell and excludes dyes
• Gram negative bacteria


  • Salmonella
  • E.coli
• Gram negative bacteria are resistant to


  Their protein making cellular machinery
• What difference do Eukaryotic cells have to Bacteria allowing antibiotics to be taken without affecting the protein production in the Eukaryotic cell

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• Types of tissues in the human body

  • Epithelial tissue
  • Connective tissue
  • Muscle tissue
  • Nervous tissue
• Cells form tissues, which form organs, which form systems in the human body