Select the incorrect pair from the following.

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(C) Amino acids are classified based on the nature of their $R$ groups.$1$. Non-polar $R$ groups: Alanine,Valine,Leucine,etc.$2$. Polar and uncharged

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Amino acids with polar and negatively charged $R$ groups - Aspartic acid,Tyrosine

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(C) Amino acids are classified based on the nature of their $R$ groups.$1$. Non-polar $R$ groups: Alanine,Valine,Leucine,etc.$2$. Polar and uncharged $R$ groups: Asparagine,Glutamine,Cysteine,Serine,etc.$3$. Polar and negatively charged (acidic) $R$ groups: Aspartic acid,Glutamic acid.$4$. Polar and positively charged (basic) $R$ groups: Lysine,Arginine,Histidine.In option $C$,Tyrosine is an aromatic amino acid with a polar hydroxyl group,but it is not classified as a negatively charged (acidic) amino acid. Aspartic acid is acidic,but Tyrosine is not. Therefore,the pair in option $C$ is incorrect.

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