Bacteria that retain the crystal-violet Gram stain and appear purple are classified as
AGram-negative
BGram-positive
Carchaea
Dacid-fast
Answer & Solution
Correct answer: B. Gram-positive
Gram-positive retain the crystal violet and look purple; Gram-negative wash out and appear pink after counterstain. The two classes have different cell-wall compositions, which is why they respond differently to many antibiotics.
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