Multiple Choice
In human digestion, where does protein digestion begin?
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5. Protein Techniques
Peptidases
Multiple Choice
In human digestion, where does the digestion of protein begin?
A
Small intestine only (via pancreatic trypsin and chymotrypsin)
B
Stomach (primarily via pepsin)
C
Mouth (via salivary amylase)
D
Large intestine (via bacterial cellulases)
Verified step by step guidance1
Understand that protein digestion involves breaking down proteins into smaller peptides and amino acids, which can be absorbed by the body.
Recall that digestion begins where enzymes capable of breaking peptide bonds first act on dietary proteins.
Identify the enzyme pepsin, which is secreted in the stomach and initiates protein digestion by cleaving peptide bonds under acidic conditions.
Recognize that although pancreatic enzymes like trypsin and chymotrypsin further digest proteins, their action occurs later in the small intestine, not at the beginning.
Conclude that protein digestion begins in the stomach primarily via the enzyme pepsin, not in the mouth, small intestine, or large intestine.
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