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Cotranslational import means that a protein enters the endoplasmic reticulum

  • A.having first passed through the Golgi
  • B.while it is still being synthesised
  • C.only after synthesis is complete
  • D.without the use of any ribosome

Answer: B

The ribosome docks on the membrane and threads the growing chain straight through a channel into the lumen. Import into mitochondria works the other way, after the protein is finished. The two import routes are quite distinct and use different targeting signals.

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