Multiple choice

The 'Gram Stain Test' is useful in classifying two distinct types of bacteria based on the structural differences of their

  1. cell wall

  2. cell membrane

  3. histone proteins

  4. endoplasmic reticulum
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A Correct answer
Explanation

Gram staining (or Gram's method) is a method of differentiating bacterial species into two large groups (Gram-positive and Gram-negative). It is based on the chemical and physical properties of their cell walls. (Hence, option '1' is correct). Primarily, it detects peptidoglycan, which is present in a thick layer in Gram-positive bacteria. A Gram-positive results in a purple/blue colour while a Gram negative results in a pink/red colour.

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