why bacteria stain differently

• what is the function of the gram stain technique


  it is used by microbiologists to distinguish between two types of bacteria
• what two types of bacteria is the gram stain technique used to distinguish between


  positive grams(+ve) and negative grams(-ve)
• how does the gram stain technique work


  the different staining properties are due to differences in the chemical compositions of the cell walls
• what does a gram positive bacterial cell look like

  
• what does a gram negative bacterial cell look like

  
• give one word to describe the peptidoglycan cell wall of a gram positive bacterial cell


  thick
• give one word to describe the peptidoglycan cell wall of a gram negative bacterial cell


  thin
• which bacterial cell has lipopolysaccharides , gram positive or gram negative .


  gram negative
• what can be found on both the positive and negative gram cell walls at the bottom


  plasma membranes
• how many layers are found in a gram positive bacterial cell


  2
• what 2 layers are found in a gram positive bacterial cell

  a thick peptidoglycan layer and the plasma membrane
• what does a gram negative bacterial cell have on the top layer that the gram positive doesn't


  an outer lipopolysaccharide membrane
• what difference does a negative gram having a outer lipopolysaccharide membrane have on the outcome of the gram stain experiment


  the outer lipopolysaccharide membrane will absorb the counter stain safranin and appear red
• what difference does a negative gram having a outer lipopolysaccharide membrane have on the properties of the bacterial cell


  it will make then non susceptible to some antibiotics such as penicillin or lysozyme
• what is found in the thick peptidoglycan layer of a positive gram bacterial cell


  long acidic polysaccharides
• what is found attached to the lipopolysaccharide membrane of a negative gram bacterial cell


  polysaccharide chains attached to the lipids
• why is penicillin relatively safe for humans to take


  human cells do not have cell walls and they do not make petidoglycan,therefore there is no effect on human cells