One function of HCl secreted in the stomach is to convert pepsinogen into the active enzyme pepsin. Why don't stomach cells simply secrete pepsin instead?
A. If cells produced active pepsin, they would digest their own cellular proteins.
B. Only the pepsinogen version is able to stabilize fat-water emulsions.
C. Pepsin is denatured and rendered inactive in solutions with low pH.
D. Adequate amounts of pepsin are already manufactured by the pancreas.
Answer: A
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