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Archaea differ from bacteria most fundamentally in

  • A.the chemistry of their membranes and walls
  • B.possessing a true membrane-bound nucleus
  • C.being unable to survive extreme conditions
  • D.having no genetic material of their own

Answer: A

Ether-linked membrane lipids and walls lacking peptidoglycan set them apart, and molecular phylogeny places them as a separate domain of life. They remain prokaryotic, having no nucleus, so the difference is chemical and genetic rather than structural.

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