Major Classes of Antibiotics Summary. Bacteria themselves can be divided into two broad classes – Gram-positive and Gram-negative. The classes derive these names from the Gram test, which involves the addition of a violet dye to the bacteria. Gram-positive bacteria retain the colour of the dye, whilst Gram-negative bacteria do not, and are instead coloured red or pink. Gram-negative bacteria are more resistant to antibodies and antibiotics, because they have a largely impermeable cell wall.
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Differences between Gram Positive and Gram Negative Bacteria
Gram cells---Gives a side-by-side visual comparison of the differences of a gram positive and a gram negative cell
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