Multiple choice

Which of the following statements is true?

  1. Gram positive become red after counter staining.

  2. Gram negative becomes purple after counter staining.

  3. Gram negative organisms lack secondary membranes and lipopolysaccharide.

  4. Gram positive organisms lack the secondary membrane and lipopolysaccharide.

  5. Gram positive organisms have the secondary membrane and lipopolysaccharide.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

True statement: Gram positive organisms lacks the secondary membrane and lipopolysaccharide. Their cell wall is typically rich with peptidoglycan, therefore they are able to retain the crystal violet stain that is purple or violet colour.

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