Which of the following is not a purine?

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(D) Nucleic acids contain two types of nitrogenous bases: purines and pyrimidines.$1$. Purines include $Adenine$ and $Guanine$.$2$. Pyrimidines includ

Vedclass · Accepted Answer

Cytosine

Vedclass · Answer

(D) Nucleic acids contain two types of nitrogenous bases: purines and pyrimidines.$1$. Purines include $Adenine$ and $Guanine$.$2$. Pyrimidines include $Cytosine$,$Thymine$,and $Uracil$.$Caffeine$ is a xanthine alkaloid,which is a derivative of purine,but it is not one of the standard nitrogenous bases found in nucleic acids.However,among the given options,$Cytosine$ is a pyrimidine,not a purine. Therefore,$Cytosine$ is the correct answer as it is a pyrimidine.

$A$. Adenine	$I$. Uracil structure
$B$. Cytosine	$II$. Thymine structure
$C$. Thymine	$III$. Adenine structure
$D$. Uracil	$IV$. Cytosine structure

Similar Questions

When two nucleotides are linked together by a phosphodiester bond to form a dinucleotide,which carbon atoms of the pentose sugar of the nucleotides are involved in the linkage?

Uracil is a base present in $RNA$ with the following structure. The percentage of $N$ in uracil is $............$.
Given:
Molar mass $N = 14 \, g \, mol^{-1} ; O = 16 \, g \, mol^{-1} ; C = 12 \, g \, mol^{-1} ; H = 1 \, g \, mol^{-1}$.

Match List $-I$ with List $-II$.
$A$. Adenine $I$. Uracil structure
$B$. Cytosine $II$. Thymine structure
$C$. Thymine $III$. Adenine structure
$D$. Uracil $IV$. Cytosine structure

Choose the correct answer from the options given below:

The structure of $DNA$ is

What are the positions of $N$ atoms present in the pyrimidine ring of nucleic acids?

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