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Which one of the following statement is not ture?A. `alpha`-Carbon of `alpha`-amino acid is asymmetricB. All proteins are found in L - formC. Human body can synthesize all proteins they needD. At `pH = 7` both amino and carboxylic groups exist in ionised form |
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Answer» Correct Answer - D Only at the pH corresponding to the isoelectric point `(pI)`, the amino acid exist as a dipolar ion with zero net charge. Even though the naturally occuring chiral `alpha`-amino acids can exist as pairs of enantiomers, only L- amino acids are found in proteins. |
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