Gram Positive and Negative
Do gram negative and gram positive
cell walls give a bacteria a general polarity, making a gram
negative cell hydrophobic and a gram positive cell hydrophilic?
No, the term Gram positive and negative have nothing
to do with charge. They are used to describe the
response of bacterial cells to a staining procedure
developed by Gram. If the bacteria stain dark purple
one calls them Gram-positive, if they are red one
calls them 'negative'.
Read more about Gram staining at
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Update: June 2012