Ornithine is an amino acid that is not used in the synthesis of proteins, but is an important intermediate in several metabloic pathways including the urea cycle and the synthesis of polyamines. It has a perfectly ordinary terminal amino group and terminal carboxyl group like any other amino acid and a side chain with a single ionizable side group with a pKa of 10.3. If ornithine is placed in solution at pH 7.0, it has a net charge of +1. What would the net charge on this amino acid be if the pH of the solution was raised to pH 12.0? Please explain your reasoning.

Write the structure formula, three-letter and one-letter abbreviation for each essential amino acid at pH 7. Tryptophan Valine Leucine Isoleucine

Serine is an uncharged, polar amino acid (below and left). Threonine (below and right) is another uncharged, polar amino acid. Illustrate the hydrolysis of a dipeptide that was made from these two amino acids. Be sure to write all involved reactants and products in the structural form like Serine, and as a proper chemical equation; eg. reactant(s) – product(s). Your diagram of the dipeptide must show the N-terminal and C-terminal ends at opposite sides of the dimer molecule, and you need to indicate where the peptide bond is with an arrow/highlighter. 2. H C-N OH NH, но CH, CH,-CH -C-COOH он

Consider each dipeptide. Part: 0/4 Part 1 of 4 N—C—COO བཙས་མའི་ཡའི་ཡ[ཡ་སྦ་ Identify the amino acid(s) present in this structure. Check all that apply. ☐ leucine ☐ phenylalanine ☐ tyrosine ☐ valine ☐ methionine ☐ glutamine ☐ alanine ☐ threonine ☐ serine ☐ cysteine ☐ glycine ☐ isoleucine ☐ asparagine