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Apoptosis requires energy from the dying cell, which means it

  • A.depends on ATP and is an active process
  • B.can occur only in cells lacking mitochondria
  • C.happens faster when the oxygen supply fails
  • D.cannot occur in a multicellular organism

Answer: A

A cell that has run out of ATP dies by necrosis instead, since the orderly programme cannot be carried out. This is one reason severe ischaemia produces necrosis rather than apoptosis. The cell must be alive enough to kill itself in an orderly way.

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