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Q.

Which one of the following pair is a purine pair?

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a

Cytosine, Thymine

b

Adenine, Thymine

c

Adenine, Guanine

d

Uracil, Guanine

answer is C.

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Detailed Solution

Each nucleotide is made up of 3 components nitrogen base, pentose sugar and phosphate . Nitrogen bases are of two types purines and pyrimidines. Purines are dicyclic and 9 -membered . Pyrimidines are monocyclic and 6 membered . Adenine(A) and guanine(G) are purines. Cytosine(C) uracil(U) and thymine(T) are pyrimidines. 

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Which one of the following pair is a purine pair?