Mitochondria contain their own genome and duplicate by fission. even so,Mitochondria cannot function for long when isolated from the rest of the cell because they are endosymbionts.
Organelles called mitochondria are focused on cellular respiration, which is how a cell gets its energy. Mitochondria and other organelles are found only in eukaryotic cells; they are absent in prokaryotes.
Endosymbiosis, in which one cell was swallowed by another and eventually started to function within it, is the theory put forth by scientists as to how mitochondria evolved. In exchange for other functions of metabolism, mitochondria produce energy in a symbiotic relationship with cells. Thus, mitochondria are dependent on their host cell for survival.
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