The rate of energy expenditure of a typical 70-kg person at rest is about 70 watts (W), like that of a light bulb. (a) Express this rate in kilojoules per second and in kilocalories per second. (b) How many electrons flow through the mitochondrial electron-transport chain per second under these conditions? (c) Estimate the corresponding rate of ATP production. (d) The total ATP content of the body is about 50 g . Estimate how often an ATP molecule turns over in a person at rest.

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Mitochondrial Mutations

A mitochondrion is a cellular organelle that serves as the site for cellular respiration and energy production (ATP or Adenosine Triphosphate). It is a double-membrane-bound organelle and is only present in eukaryotic cells.