Which among the following amino acids has the | vedclass

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(D) The general formula for an amino acid is $NH_2-CH(R)-COOH$. The molecular mass depends on the side chain $R$. For $Glycine$,$R = H$ (molecular for

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Glycine

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(D) The general formula for an amino acid is $NH_2-CH(R)-COOH$. The molecular mass depends on the side chain $R$. For $Glycine$,$R = H$ (molecular formula $C_2H_5NO_2$,molar mass $\approx 75 \ g/mol$). For $Serine$,$R = CH_2OH$. For $Aspartic \ acid$,$R = CH_2COOH$. For $Proline$,it is a cyclic amino acid with a larger structure. Since $Glycine$ has the simplest side chain $(H)$,it has the lowest molecular mass among the given options. Therefore,the correct option is $D$.

Which among the following amino acids has the lowest molecular mass?

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$H_3N^+-CH(COOH)-CH_2COOH \leftrightarrow{pK_1=1.88} H_3N^+-CH(COO^-)-CH_2COOH \leftrightarrow{pK_R=3.65} H_3N^+-CH(COO^-)-CH_2COO^- \leftrightarrow{pK_2=9.60} H_2N-CH(COO^-)-CH_2COO^-$
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