length of DNA?
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Explanation:
Considering a mean length in a diploid cell of 206.62 cm and the latest estimation of a mean of 3 × 1012 nucleated cells for a reference human being [38, 39], the total extension in length of all nuclear DNA molecules present in a single human individual is of about 6.20 billion km (6.20 × 1012 m)
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Answer:
The DNA inside each of your cells is longer than you are, but packs down into a space smaller than you can see.
The DNA in your cells is packaged into 46 chromosomes in the nucleus. As well as being a naturally helical molecule, DNA is supercoiled using enzymes so that it takes up less space.
Try holding a piece of string at one end, and twisting the other. As you add twist, the string creates coils of coils; and eventually, coils of coils of coils. Your DNA is arranged as a coil of coils of coils of coils of coils! This allows the 3 billion base pairs in each cell to fit into a space just 6 microns across.
If you stretched the DNA in one cell all the way out, it would be about 2m long and all the DNA in all your cells put together would be about twice the diameter of the Solar System.
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