The part of DNA molecule that varies among DNA molecule is

Phosphate molecule

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Nitrogen base

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Sugar molecule

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All of the above

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Solution

The correct option is B Nitrogen base
DNA molecules vary according to the presence of nitrogenous bases. The combination of purines and pyrimidines varies, but follows Chargaff's rule. Examples for nitrogenous bases in DNA are: Adenine, Guanine, Thymine and Cytosine. Here, they pair according to complementary base pairing rule.

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