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Discussion

Cytochrome c, released from mitochondria during apoptosis, normally functions in

  • A.the transport of glucose into the cell
  • B.the electron transport chain
  • C.the replication of nuclear DNA
  • D.the synthesis of membrane lipids

Answer: B

Its role in death is quite separate from its everyday job in respiration, and the double use is a striking piece of economy. Its appearance in the cytosol is an unambiguous signal that something has gone wrong. The same protein therefore serves life and death in one cell.

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