what does 10 bp in each turn mean

Dear student,
10bp in each turn means that the number of base pairs present in a single turn of a DNA helix is equal to 10. For example in a B form of DNA, there are 10 base pairs (bp) per turn of DNA helix. Since there are 10 base pairs per turn, the structure repeats after the particular distance. The bp here stands for the unit which consists of two complementary nucleobases bound to each other by hydrogen bonds.
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