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Misfolded proteins in the endoplasmic reticulum are

  • A.sent onward to the Golgi unchanged
  • B.stored permanently within the lumen
  • C.secreted from the cell immediately
  • D.exported to the cytosol and degraded

Answer: D

Quality control retains them, and persistent failures are pushed back out and destroyed by the proteasome. An accumulation of such proteins triggers the unfolded protein response. That response is the cell's attempt to clear the backlog before damage spreads.

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