Number of nucleotide pairs present in one turn of DNA helix is

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Solution

The correct option is C 10
The two antiparallel polynucleotide chains of DNA are coiled around the same axis while bases are present at the right angle to the axis. Since, one complete turn of the double helix is 3.4 nm long and each of which has 10 base pairs, the distance between two consecutive base pairs 0.34 nm. The correct answer is C.

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