Which of the following pairs is mismatched?

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(A) $1$. Purines are double-ring nitrogenous bases,which include Adenine $(A)$ and Guanine $(G)$. Cytosine $(C)$ is a pyrimidine (single-ring structur

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Purine - Cytosine

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(A) $1$. Purines are double-ring nitrogenous bases,which include Adenine $(A)$ and Guanine $(G)$. Cytosine $(C)$ is a pyrimidine (single-ring structure). Therefore,the pair Purine-Cytosine is mismatched.$2$. Pyrimidines are single-ring nitrogenous bases,which include Cytosine $(C)$,Thymine $(T)$,and Uracil $(U)$. Thus,Pyrimidine-Uracil is a correct match.$3$. Cysteine is an amino acid with a sulfhydryl group,classified as polar and uncharged. This is a correct match.$4$. Hexokinase is an enzyme that catalyzes the transfer of a phosphate group from $ATP$ to glucose,belonging to the class of Transferases. This is a correct match.

Column $I$	Column $II$
$A$. Starch	$i$. Protein synthesis
$B$. Hemoglobin	$ii$. Sex hormones
$C$. $RNA$	$iii$. Storage product
$D$. Steroids	$iv$. Transport of gases

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Match the following columns:

Column $I$ Column $II$

$A$. Starch $i$. Protein synthesis

$B$. Hemoglobin $ii$. Sex hormones

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$D$. Steroids $iv$. Transport of gases

Which of the following represents the correct structure of cytosine?

Identify the molecule shown in the figure.

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