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Q.

Which of following processes occurring in the stomach is autocatalysis?

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a

 Pepsin activating more pepsinogen molecules.

b

 Low pH denaturing the proteinaceous substances in food.

c

 Low pH activating pepsinogen to pepsin.

d

 Absorption of monomeric molecules in chyme.

answer is D.

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Detailed Solution

Pepsin activating more pepsinogen molecules is the autocatalysis process occurring in the stomach.

When the product of a reaction catalyzes its reaction, is said to be an autocatalysis process.

Pepsin is a biocatalyst, that catalyzes the conversion of inactive pepsinogen to active pepsin in an acidic environment( in the presence of HCl).

It acts as an acid protease that performs acid-base catalysis in the stomach.

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