Questions from Organic Chemistry

Q: Using three- and one-letter abbreviations, show the sequence

Using three- and one-letter abbreviations, show the sequence of amino acid residues in the following pentapeptide:

Q: Determine which of the following peptides will have a higher molecular weight

Determine which of the following peptides will have a higher molecular weight. (Hint: It is not necessary to actually calculate the molecular weight of each peptide, but rather, just compare the side...

Q: Compare the following tripeptides and determine whether they are constitutional isomers or

Compare the following tripeptides and determine whether they are constitutional isomers or the same compound: Ala-Gly-Leu and Leu-Gly-Ala

Q: Draw the s-trans conformation of the dipeptide Phe-Leu

Draw the s-trans conformation of the dipeptide Phe-Leu and identify both the N terminus and the C terminus.

Q: Draw the s-cis conformation of the dipeptide Phe-Phe

Draw the s-cis conformation of the dipeptide Phe-Phe and identify the source of the large steric interaction associated with that conformation.

Q: Using a bond-line structure, show the tetrapeptide obtained when

Using a bond-line structure, show the tetrapeptide obtained when two molecules of Cys-Phe are joined by a disulfide bridge.

Q: Aspartame is an artificial sweetener sold under the trade name NutraSweet.

Aspartame is an artificial sweetener sold under the trade name NutraSweet. Aspartame is the methyl ester of a dipeptide formed from Laspartic acid and L-phenylalanine and can be summarized as Asp-Phe...

Q: Bacitracin A is produced by bacteria and therefore contains some residues that

Bacitracin A is produced by bacteria and therefore contains some residues that are not from the list of 20 naturally occurring amino acids. a. Identify which amino acid residues are found in Table 25...

Q: Draw the structure of the initial PTH derivative formed when the tripeptide

Draw the structure of the initial PTH derivative formed when the tripeptide AlaPheVal undergoes an Edman degradation.

Q: A peptide with 22 amino acid residues is treated with trypsin to

A peptide with 22 amino acid residues is treated with trypsin to give four fragments, while treatment with chymotrypsin yields six fragments. Identify the sequence of the 22 amino acid residues in the...