Which of the following statements about alpha | vedclass

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(C) $1$. Methionine is an essential amino acid, which is correct.$2$. Glycine $(H_2N-CH_2-COOH)$ has no chiral carbon atom, so it does not exhibit ena

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Glycylalanylglutamine has three amide linkages

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(C) $1$. Methionine is an essential amino acid, which is correct.$2$. Glycine $(H_2N-CH_2-COOH)$ has no chiral carbon atom, so it does not exhibit enantiomerism. This is correct.$3$. Glycylalanylglutamine is a tripeptide formed by three amino acids (Glycine, Alanine, Glutamine). $A$ tripeptide contains only two peptide (amide) linkages. Thus, the statement that it has three amide linkages is incorrect.$4$. Zwitterions of amino acids contain both acidic $(-COO^-)$ and basic $(-NH_3^+)$ groups, allowing them to act as amphoteric substances. This is correct.

Which of the following statements about $\alpha$-amino acids of proteins is incorrect?

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