Problem 1 Draw the twenty canonical amino acids (encoded in biological proteins) as they would appear at pH = 7, including stereochemistry found in encoded proteins. Next to each amino acid, give its name and both its 3- letter and 1-letter identifications.

Question:- Alpha-endorphin is a peptide with an amino acid sequence of YGGFMTSEKSQTPLVT. How many charges does it have at pH 7?

Time remaining: 00:08:55 Chemistry Consider a peptide with the following amino acid sequence: H2N-ASENHLDGCPYTKSRG-COOH Analyze the predominate protonation state and thus dominate charge (+1, 0, -1) of the residues in this peptide at pH 3, 6, and 10 by filling in the table below, identifying the relevant pKa appropriate for each residue. (Note that choice of pKa and its. application will be graded independently; e.g., if you can choose the wrong pKa but apply it correctly, you will lose points only for the pKa.) AA Residue pKa Charge pH 3 Charge pH 6 Charge pH 10 A         S         E         N         H         L         D         G         C         P         Y         T         K         S         R         G

Question: What is the thermodynamic driving force behind the formation of a peptide bond and how does it relate to the properties of the amino acid residues involved?