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(A) Alanine is a neutral amino acid with an isoelectric point $(pI)$ of approximately $6.0$.In an acidic medium ($pH$ $2-4$), which is below the $pI$,

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$I$ and $II$

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(A) Alanine is a neutral amino acid with an isoelectric point $(pI)$ of approximately $6.0$.In an acidic medium ($pH$ $2-4$), which is below the $pI$, the amino group becomes protonated, and the molecule exists as a cation: $H_{3}N^{+}CH(CH_{3})COOH$ (Structure $I$).In a basic medium ($pH$ $9-11$), which is above the $pI$, the carboxyl group becomes deprotonated, and the molecule exists as an anion: $H_{2}NCH(CH_{3})COO^{-}$ (Structure $II$).Therefore, the correct pair is $I$ and $II$.

Within the list shown below, the correct pair of structures of alanine in $pH$ ranges $2-4$ and $9-11$ is:
$I$. $H_{3}N^{+}CH(CH_{3})COOH$
$II$. $H_{2}NCH(CH_{3})COO^{-}$
$III$. $H_{3}N^{+}CH(CH_{3})COO^{-}$
$IV$. $H_{2}NCH(CH_{3})COOH$

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Within the list shown below, the correct pair of structures of alanine in $pH$ ranges $2-4$ and $9-11$ is:$I$. $H_{3}N^{+}CH(CH_{3})COOH$$II$. $H_{2}NCH(CH_{3})COO^{-}$$III$. $H_{3}N^{+}CH(CH_{3})COO^{-}$$IV$. $H_{2}NCH(CH_{3})COOH$