Biology

Mitochondria are unique among organelles because they have their own DNA.

This mitochondrial DNA (mtDNA) is circular and encodes a small number of proteins, as well as transfer RNAs (tRNAs) and ribosomal RNAs (rRNAs) necessary for mitochondrial function. This feature supports the endosymbiotic theory, which proposes that mitochondria originated from free-living prokaryotic organisms that were engulfed by ancestral eukaryotic cells.

The other options are incorrect:

They lack membranes: Mit...