*an [[organelle]] in eukaryotic cells that contains the [[enzyme|enzymes]] of the [[citric_acid_cycle|citric acid cycle]], the [[respiratory_chain|respiratory chain]], and [[oxidative_phosphorylation|oxidative phosphorylation]]. | *an [[organelle]] in eukaryotic cells that contains the [[enzyme|enzymes]] of the [[citric_acid_cycle|citric acid cycle]], the [[respiratory_chain|respiratory chain]], and [[oxidative_phosphorylation|oxidative phosphorylation]]. |