Multiple choice

Compared to gram-negative bacteria, gram-positive bacteria

  1. retain the violet dye rather than the red dye

  2. are more resistant to antibiotics

  3. have less peptidoglycan

  4. have more complex cell walls
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Gram-positive bacteria take up the crystal violet stain used in the test, and then appear to be purple-coloured when seen through a microscope.

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