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.

Column-$I$	Column-$II$
$P$. Bacteriophage $\phi \times 174$	$I$. $5386$ nucleotides
$Q$. Bacteriophage lambda	$II$. $48502 \, bp$
$R$. Escherichia coli	$III$. $3.3 \times 10^9 \, bp$
$S$. Human haploid $DNA$	$IV$. $4.6 \times 10^6 \, bp$

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

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Column-$I$ Column-$II$

$P$. Bacteriophage $\phi \times 174$ $I$. $5386$ nucleotides

$Q$. Bacteriophage lambda $II$. $48502 \, bp$

$R$. Escherichia coli $III$. $3.3 \times 10^9 \, bp$

$S$. Human haploid $DNA$ $IV$. $4.6 \times 10^6 \, bp$

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