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Monocercomonoides is a unique genus of eukaryotic microorganisms because of its complete lack of mitochondria or any mitochondrion-related organelles (MROs). This observation is confirmed by the Monocercomonoides genome.
Without mitochondria (singular, mitochondrion), higher animals would likely not exist because their cells would only be able to obtain energy from anaerobic respiration (in the absence of oxygen), a process much less efficient than aerobic respiration.
You can't survive without mitochondria, the organelles that power most human cells. Nor, researchers thought, can any other eukaryotes—the group of organisms we belong to along with other animals, plants, fungi, and various microscopic creatures
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