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Q.
Which one of the following bases is not present in DNA?
Molecular Basis of Inheritance
Solution:
DNA is a polymer consisting of a long chain of monomers called nucleotides. Each nucleotide has three parts - a sugar; two nitrogen containing ring structure called purine (adenine, guanine) and pyrimidine base (thymine and cytosine); and a phosphate group. In RNA purine bases are represented by adenine and guanine and the pyrimidine bases are uracil and cytosine.