MCAT Biology Question 125: Answer and Explanation
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Question: 125
5. Which of the following correctly lists two organs in which proteins are digested?
- A. Mouth and stomach
- B. Stomach and large intestine
- C. Stomach and small intestine
- D. Small intestine and large intestine
Correct Answer: C
Explanation:
Protein digestion begins in the stomach, where pepsin (secreted as pepsinogen) hydrolyzes specific peptide bonds. Protein digestion continues in the small intestine as trypsin (secreted as trypsinogen), chymotrypsin (secreted as chymotrypsinogen), carboxypeptidases (secreted as procarboxypeptidases), aminopeptidase, and dipeptidases hydrolyze specific parts of the peptide. No protein digestion occurs in the mouth or large intestine.