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Most of the proteins working inside a mitochondrion are encoded by

  • A.genes in the chloroplast DNA
  • B.no genes at all
  • C.genes in the cell nucleus
  • D.genes in the mitochondrial DNA

Answer: C

Over the course of evolution most of the original bacterial genes moved to the nucleus, leaving the organelle with a very reduced genome. The proteins are made in the cytosol and imported afterwards. Targeting sequences on each protein direct it to the correct compartment.

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