Multiple choice

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

  1. Pancreatic endopeptidases continue to digest proteins in the duodenum.

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

  3. Protease enzymes are potentially dangerous.

  4. Rennin is normally only produced by infant mammals.

  5. Pepsin is an exopeptidase.
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E 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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