Solution:Concept: A serine protease called trypsin hydrolyzes proteins in the gastrointestinal tract of numerous mammals.
We must ascertain how trypsin functions and acts.
Trypsin, which is released by the pancreas into the duodenum and is activated by enterokinase, which is secreted by tiny intestinal cells, is the active form of trypsinogen.
In the duodenum, trypsin catalyses the hydrolysis of peptide bonds, dissolving proteins into smaller peptides.
This also occurs in the small intestine, which has a somewhat alkaline environment (about pH 8) .
As a result, the pancreas' production of the digesting enzyme trypsin functions in an alkaline environment.
Thus, trypsin functions in an alkaline environment and acts on the protein in the duodenum.
Hence, the appropriate response choice (4) .