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Cells with thick peptidoglycan walls resist that step, keeping the crystal violet and appearing:

APale green
BColourless
CDeep purple
DLight pink
Answer & Solution
Correct answer: C. Deep purple
1. The primary dye stays in. 2. These are the gram-positive cells. 3. They appear deep purple. _Source: OpenStax Microbiology, Chapter 2, How We See the Invisible World._
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