Multiple choice

Which of the following statements characterizes Gram +ve bacteria?

  1. Gram +ve bacteria can be lysed by complement.

  2. They have a particularly thick outer carbohydrate capsule.

  3. Gram +ve bacteria are stained by crystal violet.

  4. They contain endotoxin.

  5. Basal body of the flagellum contains four rings.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Staining with crystal violet is the means by which bacteria have been classified historically. This primitive but quick (and messy when done by hand!) classification has been of practical use however, and so has survived.

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