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1. Identify the amino acids in the following tripeptide and provide the major structure of the tripeptide at pH 3, 7, 12. H O ?? ?? 2a. Ideally, one could synthesize a peptide without the use of protecting groups In the following problem, provide a mechanism for the synthesis of the dipeptide Phe-Trp. Assume that the only product formed is Phe-Trp. N-C-N Ph (DCC) OH Phe-Trp

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Answer 1): Lysine NH3 NH Proline Tryptophan H@H O он он at pH 3 amino groups of proline and lysine side chain will be protona

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