Practice question

Question

Following observations are made regarding a peptide sequence. - The peptide is inert to Ellman’s reagent. However, on reacting with beta-mercaptoethanol, the peptide gives a positive Ellman’s test. - The peptide sequence gives a broad minimum around 211 nm in the CD spectrum. - With increasing concentration of the peptide, the melting temperature of the peptide increases. - On treating the peptide with D2O, half the total number of amides get exchanged. Which one of the following statements is correct?