Which statement correctly explains the Gram stain reaction of archaeal cells?
A. Some are Gram-positive and some are Gram-negative due to the diverse chemical structure.
B. They don't stain - basic dyes used in the Gram stain don't adhere to archaeal cells.
C. They are Gram-negative due to the lack of peptidoglycan in their cell walls.
D. They are Gram-positive due to the pseudomurein layer in their cell walls.
Answer: A
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