Draw the structure of the dipeptide Thr-Cys at pH7

Write a structural formula for a tetrapeptide composed of phenyl-alanine, glycine, aspartic acid, and histidine in which the phenylalanine is N-terminal and the histidine is C-terminal. How many different tetrapeptides could be written that fit the criteria in this question?

Draw the structure of the PTH derivative you would obtain by Edman degredation of the peptide: ALPF.

Draw the titration curves for the following AA’s: Aspartic acid, Alanine, Lysine, Valine, Serine, and Trrosine.

The enzyme creatine kinase catalyzes the ATP-dependent phosphorylation of creatine. Propose a mechanism for the reaction described using the curved arrow convention. Show the complete structure of the nucleotide.

At what pH does peptide the His-Arg have a net charge of +1.7?

Draw the structural formula of the oligopeptide if the amino acids are arginine, glutamine, glycine, methionine and glutamic acid considering the first amino acid is the N-terminus

Draw the tetrapeptide Met-Ile-Lys-Glu at a ph of 7?

Draw tripeptide Lys-Thr-Glu at pH 7.4 and circle the six atoms that are restricted in the same plane.

Assume a pH of 7.0 in aqueous solution. Please draw a tripeptide containing (in this order) a residue with a residue with an non-polar sidechain containing more than five carbons, a positively (+1) charged sidechain, and a residue with a polar (but not charged) sidechain with more than two carbons. Please give the names of the amino acid residues that you drew.