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Question

The part of DNA molecule that varies among DNA molecule is
  1. Phosphate molecule
  2. Nitrogen base
  3. Sugar molecule
  4. All of the above

A
Sugar molecule
B
Phosphate molecule
C
Nitrogen base
D
All of the above
Solution
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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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