Which of the following enzymes initiaties the digestion of protein?

Question

BlackTom AI · Accepted Answer

To tackle this question, I’ll evaluate what each option does in the context of protein digestion.
Option 1: trypsin. This enzyme is produced in the pancreas and active in the small intestine, where it cleaves peptide bonds in proteins. While essential for protein digestion, it is not the initiator and acts later in the digestive process, after reaching the small intestine.
Option 2: salivary amylase. This enzyme begins the digestion of carbohydrates (starch) in the mouth, not proteins. Its substrate and role are unrelated to protein digestion, making it incorrect for this question.
Option 3: pepsin. Pepsin is the digestive enzyme that begins protein digestion in the stomach by cleaving peptide bonds under acidic conditions. It is the classic initiator of protein breakdown, functioning early in the digestive process.
Option 4: hydrochloric acid. HCl is not an enzyme; it creates the acidic environment necessary to activate pepsinogen into pepsin and to denature proteins. Since the question asks for an enzyme, HCl does not fit as the initiator of protein digestion.
Thus, when considering which option is the initiating protein-digesting enzyme, pepsin stands out as the correct choice because it starts the actual proteolysis in the stomach, while the others either act on different macromolecules, act later in the digestion sequence, or are not enzymes at all.

Which of the following enzymes initiaties the digestion of protein?单项选择题

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