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Animal mitochondrial DNA has 13 genes that encode polypeptides, yet mitochondria make use of nearly 1500 proteins.

Which of the following is the CORRECT explanation for these observations?


Most mitochondrial proteins are not encoded by genes.


The majority of mitochondrial proteins are encoded by genes on chromosomes in the nucleus and imported into​ mitochondria.


Each mitochondrial gene encodes a large polypeptide that is cut and modified into nearly a hundred different proteins.


Each mitochondrial gene encodes an RNA that can be alternatively spliced into many different combinations to yield many protein products.

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