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The spore has

  • A.an inner membrane
  • B.an outer keratin-like coat
  • C.two peptidoglycan layers
  • D.all of the above

Answer: D

Correct answer: all of the above

The spore is built in layers: an inner membrane round the core, a cortex of modified peptidoglycan between two membranes, and an outer keratin-like coat of protein - with an exosporium outside that in some species. Each layer contributes to its extraordinary resistance.

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