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Mitochondria are membrane-bound organelles found in the cytoplasm of eukaryotic cells. They are often referred to as the powerhouse of the cell, as they are responsible for producing the majority of the cell's energy in the form of adenosine triphosphate (ATP) through the process of cellular respiration. Mitochondria contain their own DNA and ribosomes, allowing them to partially self-replicate and synthesize some of their own proteins. They play a crucial role in metabolism, apoptosis, and signaling within the cell.