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Lab Exam #1

Lab Exam #1 - 3:38:00 PM Gram and Gram After staining the...

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20/02/2008 15:38:00 Gram + and Gram –     After staining the bacteria will appear pink or purple according to structural  differences.  Gram +   ; have thick peptidoglycan exterior around their plasma membrane this layer retains the first stain resulting in a purple color Gram -  ;  have a thinner layer of peptidoglycan    It doesn’t retain as much purple dye be/c it has a thick liposaccharide layer  surrounding the peptidoglycan Population growth directly relates to the availability of resources 1. Lag Phase- cells are getting ready to divide rapidly 2. Exponential Phase- now ready to begin- the cells divide rapidly 3. Stationary Phase – resources are not sufficient to support such high  growth  rates—No net accumulation of cells,  cell birth=cell death *
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