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There are theories that the mitochondrial DNA (which is vastly different than the DNA in our cells) was incorporated via a bacteria or other organism (God knows when). This happened as a positive symbiotic relationship as the mitochondria is the powerhouse work station within a cell (the site where glucose is broken down into ATP - the essence of the energy of life). Mitochondrial DNA is simple versus that of our cells. So simple that the bacteria incorporation theory was formulated.
Think of the mitochondria as the powerplant of the cell but it sings its own song versus all the cells in your body that sing a different song. However, heart cells sing a different part of that song than a lung cell than a skin cell (but it is still the same song while the mitochondrial song is entirely different in every way).
That's all for now
Becky
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