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Which of the following statements concerning the Edman degradation method are true? Under mileily acidic conditions, the modifed peptide is cleaved into a cyclic derivative of the terminal arning acids, and a shortened peptide (minus the first amino acidf. Once the PTH amino acid is separated from the original peptide. a new cycle of sequential degradationcan begin. If a protein tas a blocked amino-terminal residue las does N-formyl methionine, for examplekit cannot react with phenyl isothiocyanate. Phenyl isothiocyanate is coupled to the aming-terminal residue