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Mitochondria use proteins to break down sugars and produce cellular energy in the form of ATP. ... No matter where mitochondrial proteins are made, they are synthesized on ribosomes that translate messenger RNA into the amino acids that form the protein chain.

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The mitochondria, apart from other things, are responsible for breaking down sugars.
During that process, proteins are consumed, which in turn, synthesises the protein.

It is not an easy subject, hope you understood my explanation well enough.


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