The Human Genome Contains DNA That Is Similar to MtDNA

Multiple Choice

The human genome contains DNA that is similar to mtDNA. Some of this DNA shows significant levels of nucleotide divergence from human mtDNA, while other nuclear DNA shows very high levels of nucleotide identity with mtDNA. Which of the following hypotheses best explains these data?

A) Nuclear DNA is older than mtDNA.
B) mtDNA is derived from the nuclear DNA with higher levels of homology.
C) mtDNA has integrated into nuclear chromosomes several times over a long span of time.
D) mtDNA and nuclear DNA share many sequences by chance.
E) Nuclear DNA has a low level of mutation compared to the mtDNA.