4. Write the equation of tripeptide Tyr-Lys-Glu formation from the correspondinga-amino acids. Designate peptide bonds in this tripeptide. What reaction can beused for their detection?5. Write the equation of tripeptide Tyr-Lys-Glu acidic hydrolysis (in the presenceof hydrochloric acid).I

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The formation of tripeptide Tyr-Lys-Glu from the corresponding amino acids involves the following peptide bonds:

The equation for the formation of tripeptide Tyr-Lys-Glu from the amino acids tyrosine (Tyr), lysine (Lys), and glutamic acid (Glu) is as follows:

Tyr - OH + Lys - NH2 → Tyr - Lys + H2O
Tyr - Lys + Glu - OH → Tyr - Lys - Glu + H2O

Peptide bonds are designated by the "-" symbol in the tripeptide structure.

The reaction that can be used for the detection of peptide bonds in this tripeptide is the biuret test. This test involves adding a dilute copper sulfate solution and sodium hydroxide to the sample, resulting in a purple color change if peptide bonds are present.

5.

The acidic hydrolysis of tripeptide Tyr-Lys-Glu in the presence of hydrochloric acid involves breaking the peptide bonds present in the tripeptide. The equation for the acidic hydrolysis of tripeptide Tyr-Lys-Glu is as follows:

Tyr - Lys - Glu + HCl + H2O → Tyr - OH + Lys - HCl + Glu - OH

In this reaction, the peptide bonds between the amino acids tyrosine, lysine, and glutamic acid are broken down into their respective free amino acids in the presence of hydrochloric acid.