Pepsin would have the greatest activity
A)immediately upon secretion into the stomach.
B)immediately upon entering the duodenum.
C)when the pH of the chyme is greater than 3.
D)when the pH of the chyme is less than 3.

Question

Quizplus · Accepted Answer

Pepsin is most active when the pH of the chyme is less than 3. This is because pepsin is a protease enzyme that works optimally in an acidic environment, which is achieved in the stomach when parietal cells secrete hydrochloric acid, lowering the pH. Therefore, option D is the correct choice.

Pepsin Would Have the Greatest Activity