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Autophagy is the process by which a cell

  • A.copies its DNA before dividing
  • B.digests its own worn-out organelles
  • C.takes in bacteria from outside
  • D.secretes enzymes into its surroundings

Answer: B

A double membrane wraps the material to be recycled and delivers it to a lysosome, returning the building blocks to the cytosol. The process becomes especially important when a cell is starved. Recycling its own components buys a starving cell time to find nutrients.

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