Explanation

Mitochondrial DNA is the circular chromosome 

The mitochondrial genome is built of 16,569 DNA base pairs

The mtDNA is double-stranded.

It contains 37 genes that encode 13 proteins, 22 tRNAs, and 2 rRNAs.

These organelles, found in all eukaryotic cells, are the powerhouse of the cell.

Additional information:

The nuclear DNA is linear

The nuclear genome is made of 3.3 billion DNA base pairs.