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What is the primary advantage of using an enzyme in a biochemical reaction?
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6. Enzymes and Enzyme Kinetics
Enzymes
Multiple Choice
Which of the following enzymes is classified as an exopeptidase?
A
Trypsin
B
Carboxypeptidase
C
Chymotrypsin
D
Pepsin
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Understand the classification of proteolytic enzymes: Proteolytic enzymes are categorized into endopeptidases and exopeptidases based on where they cleave peptide bonds. Endopeptidases cleave peptide bonds within the protein chain, while exopeptidases cleave peptide bonds at the terminal ends of the protein chain.
Review the function of each enzyme listed: Trypsin, Chymotrypsin, and Pepsin are endopeptidases because they cleave peptide bonds within the protein chain. Carboxypeptidase, on the other hand, is an exopeptidase because it cleaves peptide bonds at the carboxy-terminal end of the protein chain.
Focus on Carboxypeptidase: Carboxypeptidase specifically removes amino acids from the carboxy-terminal end of a polypeptide chain, making it an exopeptidase. This is a key distinguishing feature.
Compare the enzymes: Trypsin, Chymotrypsin, and Pepsin are involved in breaking internal peptide bonds (endopeptidase activity), whereas Carboxypeptidase acts on terminal peptide bonds (exopeptidase activity).
Conclude the classification: Based on the definitions and functions, Carboxypeptidase is the enzyme classified as an exopeptidase in this list.
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