Identify a protein-digesting enzyme.

Pepsin

The correct answer is Option (4) – Pepsin

Pepsin is a protein-digesting enzyme.

Explanation:

• Pepsin is produced in the stomach and is responsible for breaking down proteins into smaller peptides. It functions in the acidic environment of the stomach, where it hydrolyzes peptide bonds in proteins, converting them into shorter chains of amino acids.
• Lipase is an enzyme that breaks down fats, amylase breaks down carbohydrates, and collagen is a structural protein found in connective tissues, not involved in digestion.