The enzyme pepsin functions in:

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(B) Pepsin is a proteolytic enzyme secreted by the chief cells of the stomach in the form of an inactive precursor called pepsinogen. In the presence

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Acidic medium in the stomach

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(B) Pepsin is a proteolytic enzyme secreted by the chief cells of the stomach in the form of an inactive precursor called pepsinogen. In the presence of hydrochloric acid $(HCl)$ secreted by the parietal cells,pepsinogen is converted into its active form,pepsin. Pepsin functions optimally in an acidic environment ($pH$ $1.8$ to $2.0$) within the stomach to break down proteins into proteoses and peptones.

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