Question

1. the reaction shown below is catalyzed by secretions from which organs? protein + h₂o → peptides a. pancreas and liver b. liver and duodenum c. stomach and pancreas d. duodenum and stomach

Explanation:

The reaction \( \text{protein}+\text{H}_2\text{O}\to\text{peptides} \) is a hydrolysis reaction of proteins. The stomach secretes pepsin which starts the digestion of proteins. The pancreas secretes pancreatic proteases (such as trypsin, chymotrypsin) which further break down proteins into peptides. The liver mainly functions in detoxification, bile production (for lipid digestion) etc. and is not directly involved in protein - to - peptide hydrolysis. The duodenum is just a part of the small intestine where the pancreatic and bile secretions act, but it does not secrete enzymes for this specific protein - to - peptide reaction.

Answer:

C. stomach and pancreas