Identify the correct statement among the foll | vedclass

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(D) $1$. Isoleucine and threonine have $2$ chiral centers,so option $A$ is incorrect. $2$. Glycine is achiral and optically inactive,so option $B$ is

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Amino acid,cysteine easily undergoes dimerization due to the presence of a free $-SH$ group.

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(D) $1$. Isoleucine and threonine have $2$ chiral centers,so option $A$ is incorrect. $2$. Glycine is achiral and optically inactive,so option $B$ is incorrect. $3$. Aspartic acid also contains a $-COOH$ group in its side chain,so option $C$ is incorrect. $4$. Cysteine contains a free $-SH$ group,which can undergo oxidation to form a disulfide bond (cystine),leading to dimerization. Thus,option $D$ is correct.

Identify the correct statement among the following $:$

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