The length of DNA double helix in a typical human cell is
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DNA Mechanics
around 6 feet
Each human cell has around 6 feet of DNA
coli “plasmid” DNA molecules used in genetic engineering are typically 2–10 kb (0.7–3 µm) in length; and the larger chromosomal DNAs in human cell nuclei are roughly 200 Mb or a few cm in length. Each base pair contributes about 0.34 nm of length (or “rise”) to a double-helix DNA.
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