Do this for all your DNA, and the resulting strand would be 67 billion miles long-the same as about 150,000 round trips to the Moon! So chromosomes play an important role in storing DNA molecules so that they fit in cells. If all of the DNA molecules in a single human cell were unwound from those proteins and placed end-to-end, they would stretch 6 feet. A chromosome packages a single molecule of DNA around proteins in a tight, spool-like fashion. You are correct that chromosomes contain DNA, but the structuring of the DNA into chromosomes is important. Yes, cells that divide via mitosis or meiosis both begin as somatic cells, or cells that are not reproductive cells.
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