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The part of DNA molecule that varies among DNA molecule is

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Phosphate molecule

Nitrogen base

Sugar molecule

All of these

answer is B.

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Detailed Solution

DNA molecules vary according to the presence of nitrogenous bases. The combination of purines and pyrimidines varies, but follows Chargaff's rule, nitrogenous bases in DNA are Adenine, Guanine, Thymine and Cytosine.

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