A: Pyrimidines are nitrogenous bases with a s | vedclass

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(B) $1$. Pyrimidines (Cytosine,Thymine,and Uracil) are heterocyclic aromatic organic compounds similar to pyridine,containing two nitrogen atoms at po

Vedclass · Accepted Answer

$A$ and $R$ are both true,but $R$ is not the correct explanation of $A$.

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(B) $1$. Pyrimidines (Cytosine,Thymine,and Uracil) are heterocyclic aromatic organic compounds similar to pyridine,containing two nitrogen atoms at positions $1$ and $3$ of the six-membered ring. Thus,Assertion $A$ is true.$2$. $DNA$ contains Adenine,Guanine,Cytosine,and Thymine. Uracil $(U)$ is found in $RNA$ instead of Thymine. Therefore,$DNA$ does not contain $U$. Thus,Reason $R$ is true.$3$. While both statements are scientifically correct,the fact that $DNA$ does not contain $U$ is not the reason why pyrimidines have a single-ring structure. Therefore,$R$ is not the correct explanation of $A$.

$A$: Pyrimidines are nitrogenous bases with a single-ring structure.
$R$: $DNA$ does not contain $U$ (Uracil).

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$A$: Pyrimidines are nitrogenous bases with a single-ring structure.$R$: $DNA$ does not contain $U$ (Uracil).