Multiple choice

Which of the following statements regarding the digestion of proteins in allimentary canal is INCORRECT?

  1. Rennin is normally only produced by infant mammals.

  2. Pepsin is an exopeptidase.

  3. Protease enzymes are potentially dangerous.

  4. Exopeptidases remove amino acids one by one from the ends of peptide chains.

  5. Pancreatic endopeptidases continue to digest proteins in the duodenum.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Pepsin (in gastric juice) digests proteins to peptides, 6-12 amino acids long. Pepsin is an endopeptidase, which means it hydrolyses peptide bonds in the middle of a polypeptide chain. It is unusual in that it has an optimum pH of about 2 and stops working at neutral pH.

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