When an Unknown Peptide Containing Five Amino Acids Is Treated

question 7

Multiple Choice

When an unknown peptide containing five amino acids is treated with an enzyme that hydrolyzes only the serine-leucine peptide bond, the fragments Leu-Cys, Ser, Leu-Ser are formed. What was the original amino acid sequence in the peptide?

• A)Cys-Ser-Leu-Ser-Leu
• B)Leu-Cys-Leu-Ser
• C)Leu-Ser-Leu-Cys
• D)Ser-Leu-Ser-Leu-Cys

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