If the stomach did not produce any hydrochloric acid, which enzyme will not function?

Ptyalin

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Trypsin

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Pepsin

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Collagenase

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Solution

The correct option is B Pepsin
Hydrochloric acid (HCl) converts pepsinogen to pepsin which breaks down proteins to peptides. HCl maintains a pH in the stomach of approximately 2.0. It also dissolves food and kills microorganisms. Without enough HCl, pepsinogen is no converted to pepsin which do not allow the breakdown of proteins
So, the correct answer is 'Pepsin'

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If hydrochloric acid is so strong that it can break complex food molecules, why does it not affect the walls of stomach?

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