Which of the following nitrogenous bases has | vedclass

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(A) Nitrogenous bases are classified into two categories based on their structure: purines and pyrimidines.Purines have a double-ring structure (a six

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Guanine

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(A) Nitrogenous bases are classified into two categories based on their structure: purines and pyrimidines.Purines have a double-ring structure (a six-membered ring fused to a five-membered ring),while pyrimidines have a single-ring structure.The purines are Adenine $(A)$ and Guanine $(G)$.The pyrimidines are Cytosine $(C)$,Thymine $(T)$,and Uracil $(U)$.Among the given options,Guanine is a purine and therefore possesses a double-ring structure.

Which of the following nitrogenous bases has a double-ring structure?

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