Final answer:
The incorrect aspect of mitochondrial DNA is that nucleotides placed incorrectly are not repaired due to an absence of DNA polymerase error-checking, though mtDNA does have some repair mechanisms.
Step-by-step explanation:
Which of the following is NOT true of mitochondrial DNA (mtDNA)? The aspect of mtDNA that does not hold true is the idea that a nucleotide is incorrectly placed and not repaired because DNA polymerase error-checking is lacking in the mitochondria. This is incorrect; although mtDNA lacks the extensive repair systems of nuclear DNA, it does still have some mechanisms to correct errors.
Other known facts about mtDNA include its maternal inheritance pattern where mitochondria are inherited from the mother, making it useful for tracing genealogy. Also, mtDNA mutates at a rapid rate, which is why it's valuable for studying evolutionary relationships and molecular anthropology. It is indeed true that in mammals, sperm mitochondria are usually destroyed prior to fertilization, thus they play no role in offspring's mitochondrial genomics.