Discussion
The cell wall of
Answer: A
Correct answer: gram-positive bacteria are thicker than gram-negative bacteria
The gram-positive wall is a thick multilayered sheet of peptidoglycan, some 20-80 nm; the gram-negative wall has only a thin layer of 2-7 nm, covered by an outer membrane. The thick layer retains the crystal violet-iodine complex when the cell is decolourised with alcohol, which is what makes the Gram stain work.
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