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Mitochondria are unusual organelles. They act as the power plants of the cell, are surrounded by two membranes, and have their own genome. They also divide independently of the cell in which they reside, meaning mitochondrial replication is not coupled to cell division.
Cell Energy. Date. Energy within a cell exists in the form of chemical energy. A source of this chemical energy is a. compound called adenosine triphosphate (ATP). ATP when changed to a compound called. adenosine diphosphate (ADP) releases energy for biological work in a cell.