Multiple choice

Compared to gram-negative bacteria, gram-positive bacteria

  1. retain the violet dye rather than the red

  2. are more resistant to antibiotics

  3. have less peptidoglycan

  4. have more complex cell walls
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A Correct answer
Explanation

 Gram positive bacteria stain violet due to the presence of a thick layer of peptidoglycan in their cell walls, which retains the crystal violet these cells are stained with. Alternatively, Gram negative bacteria stain red, which is attributed to a thinner peptidoglycan wall, which does not retain the crystal violet during the decoloring process.

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