2007 General Studies, all questions

UPSC Prelims 2007 · General Studies

Question 117: Science and Technology

Which of the following is not a digestive enzyme in the human system?

aTrypsin
bGastrin
cPtyalin
dPepsin

AnswerThe answer is (b).

Gastrin is a hormone released by the stomach lining that stimulates the secretion of gastric acid, so it is not an enzyme. Trypsin (pancreatic protease), ptyalin (salivary amylase, which starts starch digestion) and pepsin (gastric protease) are all digestive enzymes. Remember: names ending in -in are not always enzymes; gastrin is a hormone.

Why each option is right or wrong
  • (a) Trypsin is a protein-digesting enzyme from the pancreas.
  • (b) Correct: gastrin is a hormone, not an enzyme.
  • (c) Ptyalin is the salivary amylase enzyme.
  • (d) Pepsin is a protein-digesting enzyme of the stomach.

Explanation: written by UPSC Grade, not by UPSC.

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Source: UPSC, Civil Services (Preliminary) Examination 2007, General Studies. UPSC's own paper isn't online; the words are from a published compilation. The paper on upsc.gov.in.