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Well, all DNA in humans form double helices. However, the genetic material for mitochondria does not take up an entire length of DNA. The gene for mitochondria will only take up a very small site on the DNA molecule. U get my point? I sure hope this was useful.

----------------- All human DNA is double helical. Single-stranded DNA is only used in viruses as genetic material. Mitochondrial DNA is also very small and circular compared to chromosomes, which are extremely large and linear.

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