Gastric Peptidases and Pepsinogen Activation
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Questions and Answers

What is the role of hydrochloric acid in the activation of pepsinogen?

  • It inhibits the secretion of pepsinogen by the chief cells.
  • It changes the conformation of pepsinogen in the stomach environment. (correct)
  • It directly converts pepsinogen into pepsin.
  • It neutralizes the stomach environment for pepsinogen activation.

    • What type of peptide bonds does pepsin primarily cleave?

  • Peptide bonds containing a basic amino acid.
  • Peptide bonds containing a polar uncharged amino acid.
  • Peptide bonds containing a sulfur-containing amino acid.
  • Peptide bonds containing a carboxyl group from an acidic or aromatic amino acid. (correct)

    • What happens to dietary proteins in the presence of gastric acid?

  • They are denatured and partially unfolded for easier proteolysis. (correct)
  • They are protected from proteolysis by gastric acid.
  • They are converted into pepsinogen for digestion.
  • They are broken down into free amino acids by pepsin.

    • Where do the smaller peptides and free amino acids go after encountering peptidases?

    <p>They continue into the duodenum for further digestion.</p> Signup and view all the answers

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