Questions: Protein digestion begins in the [Select] where a [Select] pH environment converts pepsinogen into an active enzyme called pepsin. Pepsin then hydrolyzes peptide bonds to start the breakdown of large protein molecules.

Protein digestion begins in the [Select] where a [Select] pH environment converts pepsinogen into an active enzyme called pepsin. Pepsin then hydrolyzes peptide bonds to start the breakdown of large protein molecules.

Transcript text: Protein digestion begins in the $\square$ [Select] where a [Select] pH environment converts pepsinogen into an active enzyme called pepsin. Pepsin then hydrolyzes peptide bonds to start the breakdown of large protein molecules.

Solution

Protein digestion begins in the stomach where a low pH environment converts pepsinogen into an active enzyme called pepsin. Pepsin then hydrolyzes peptide bonds to start the breakdown of large protein molecules.

Explanation:

Stomach: Protein digestion starts in the stomach. The stomach secretes gastric juices, which include hydrochloric acid (HCl) and pepsinogen.
Low pH: The acidic environment (low pH) in the stomach is crucial for converting pepsinogen, an inactive enzyme precursor, into pepsin, the active enzyme. Pepsin is responsible for breaking down proteins into smaller peptides by hydrolyzing peptide bonds.

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