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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.
In plant cells, which do not contain mitochondria, the energy for cellular functions is created by the chloroplasts, which, like a mini solar cell, convert sunlight into useful energy by the creation of sugar molecules through the process of Photosynthesis.ells need a source of energy, they get this energy by breaking down food molecules to release, the stored chemical energy.This process is called 'cellular respiration' . The process is happens in all the cells in our body.