Referring to Table 27.1, identify the amino acid(s) that satisfy each of the following criteria.

(a) The most acidic amino acid

(b) The most basic amino acid

(c) The amino acids that can exist as diastereomers

(d) The amino acid that has zero optical rotation under all conditions

(e) The amino acids that are converted into other amino acids on treatment with concentrated hot aqueous NaOH solution followed by neutralization.

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TABLE 27.1 Names, Structures, Abbreviations, and Properties of the Twenty Common Naturally Occurring Amino Acids Name and abbreviations R* Amino acids with simple aliphatic side chains glycine, Gly, G alanine, Ala, A valine, Val, V leucine, Leu, L isoleucine, lle, I -H -CH3 -CH(CH3)₂ -CH₂CH(CH3)₂ -CH-CH₂CH3 CH3 [S configuration] General structure: Optical rotation of Lenantiomer in H₂O (sign of [a],) E EIE (+) (+) (-) (+) H₂N-CH- pka1 2.34 2.35 2.32 2.36 2.36 lo -0- pk₂z 9.60 9.69 9.62 9.60 9.68 РКаз Isoelectric point, pl 5.97 6.02 5.97 5.98 6.02