Both plant cells and animal cells have mitochondria. Mitochondria are known as the "powerhouses" of the cell because they generate most of the cell's supply of adenosine triphosphate (ATP), which is used as a source of chemical energy.
Viruses do not have cells and therefore do not have mitochondria, and bacteria cells typically do not have mitochondria, as they generally perform energy production through other means within their simpler cellular structure.
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