Exam 24: Amino Acids, Peptides, and Proteins

Provide the structure of L-valine at pH 12.0.

A solution of glycine has a pH equal to the pKa1 of glycine. What forms of glycine are present and in what ratio?

Provide the structure of the predominant form of L-alanine present in an aqueous solution at pH 2.

Which of the following compounds would reduce a disulfide linkage in a peptide?

What peptide coupling reagent is most commonly used in solid phase peptide synthesis?

The solid-phase method of peptide synthesis was devised by:

A protein bonded to a fat would be classified as a:

Provide the structure of the predominant form of L-leucine present in an aqueous solution at pH 2.

Amino acids have:

Show how 3-methylthiopropanal may be converted to methionine.

Describe how electrophoresis works.

Which of the following is not an example of a protein?

Provide the structure of the predominant form of glutamine present in an aqueous solution at a pH of 12.0.

Which of the following amino acids does not have an aromatic substructure within its side chain?

In biosynthesis, which amino acid serves as the source of the amino group for other amino acids?

Which amino acid's side chain is positively charged at biological pH?

Provide the necessary reagents to convert propionic acid to alanine.

Draw the structure of Val-Ala-Ser at biological pH.

What is the isoelectric point of lysine within in +/- 1 pH unit?

Provide a synthesis of isoleucine from N-phthalimidomalonic ester.