In 'B' model of DNA, the diameter is $20 A^{0}$ . It is …………… in Z DNA

23 A^{0}

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21 A^{0}

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26 A^{0}

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18 A^{0}

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Solution

The correct option is D $18 A^{0}$
Z model of DNA

Z- DNA is a left-handed helix which contains 12 nucleotide base pairs per turn. The diameter of Z-DNA is $18 A^{0} .$

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