Discussion
The nitrogenous base not present in DNA structure?
Answer: D
The base not present in DNA is Uracil (U).
DNA is built from four nitrogenous bases: adenine, guanine, cytosine and thymine. RNA uses the same first three but has uracil in place of thymine.
Adenine and guanine are the purines found in both nucleic acids, and cytosine is a pyrimidine found in both. So uracil is the only option that is not part of DNA structure.
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