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KCET2026ChemistryBiomolecules

Incorrect statement about -amino acids of proteins among the following is

Options

  1. AMethionine is an essential amino acid
  2. BGlycine doesn't exhibit enantiomerism
  3. CGlycylalanylglycine has three amide linkages
  4. DZwitterion of valine exhibits amphoteric behaviour

Correct answer

C. Glycylalanylglycine has three amide linkages

Step-by-step solution

Methionine is an essential amino acid, so the first statement is correct. Glycine is the simplest amino acid with the formula H₂N-CH₂-COOH . Since its -carbon is attached to two identical hydrogen atoms, it is achiral and does not exhibit enantiomerism. Thus, the second statement is correct. Glycylalanylglycine is a tripeptide formed by the condensation of three amino acids (glycine, alanine, and glycine). The number of peptide (amide) linkages in a peptide is equal to the number of amino acid residues minus one. T

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