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Spores surviving in baked bread come mainly from

  • A.the water added to the dough
  • B.the yeast used for leavening
  • C.the wrapper applied after baking
  • D.the flour used to make it

Answer: D

Grain is harvested from soil and carries spore-forming bacteria into the mill and so into the flour. Baking destroys vegetative cells throughout the loaf but not the spores, which is why rope arises from the crumb rather than the surface.

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