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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?

A

Most mitochondrial proteins are not encoded by genes.

B

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

C

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

D

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

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