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Part A The Gram stain, commonly used to classify a bacterial isolate into one of two groups, is based upon the characteristics of which of the following structures? See Section 26.3 (D page 526) he ribosomes he cell wall the flagella O the genetic material Submit Hints My Answers Give Up Review Part

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Ans B The cell wall

Gram stain detects the peptidoglycan present in cell walls of gram positive bacteria. So gram positive bacteria appear violet due to crystal violet and gram negative cannot retain this colour, so appear red due to counterstain safranin.

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