In the given polynucleotide chain,which of P, | vedclass

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(B) In a polynucleotide chain,nitrogenous bases are attached to the $1'$ carbon of the pentose sugar.Purines are double-ring structures (Adenine and G

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$P$ and $R$

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(B) In a polynucleotide chain,nitrogenous bases are attached to the $1'$ carbon of the pentose sugar.Purines are double-ring structures (Adenine and Guanine),while pyrimidines are single-ring structures (Cytosine,Thymine,and Uracil).In the provided diagram,the shapes representing $P$ and $R$ are larger (double-ring structure),indicating they are purines.The shapes representing $Q$ and $S$ are smaller (single-ring structure),indicating they are pyrimidines.Therefore,$P$ and $R$ represent purine nitrogenous bases.

In the given polynucleotide chain,which of $P, Q, R,$ and $S$ are purine nitrogenous bases?

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