Which of the following characteristics about the peptide Lys-Met-Cys-Phe-Ala-Trp is correct?
A)It has a molecular weight around 700 kDa and shows a strong absorption band at 280 nm.
B)Treatment with carboxypeptidase results in lysine and a peptide.
C)Trypsin digestion produces an amino acid and a pentapeptide with Met on the amino end.
D)Chymotrypsin digestion yields 2 tripeptides.

Question

Quizplus · Accepted Answer

Trypsin is an enzyme that cleaves peptide chains after the amino acids lysine and arginine. Thus, in the peptide Lys-Met-Cys-Phe-Ala-Trp, tryptic digestion would result in a pentapeptide with Met on the amino end, in addition to an uncharacterized amino acid. This matches with option C. Options A, B, and D are incorrect because they describe properties that do not match with the given peptide sequence.

Which of the Following Characteristics About the Peptide Lys-Met-Cys-Phe-Ala-Trp Is