Which of the following pairs is mismatched?

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Question

(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.

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