1. The melanocyte-stimulating peptide hormone -melanotropin has the following sequence: Ser-Tyr-Ser-Met-Glu-His-Phe-Arg-Trp-Gly-Lys-Pro-Val. (a) Write the sequence using the one-letter abbreviations.
2. How is named the structure of the protein in which the peptide chains are connected by hydrogen bonds between the peptide groups of amino acid residues acquire a spiral shape? A) The primary structure of the protein B) The secondary structure of the protein B) the tertiary structure of the protein D), the quaternary structure of protein
3. Which of the peptides, the following will give a positive reaction Foll (sulfhydryl reaction)? Justify your answer. a) NH2-Ala-Cys-Phe-Cys-COOH b) NH2-Gly-Val-Gly-Ser-Ala-COOH;
4. Write the names and formulas of all peptides, which can be obtained from the following amino acids: methionine, lysine,