The optimum pH of pepsin, the protease in the stomach, is approximately
A12
B9
C7
D2CORRECT
JUPEBBiologyEnzymes
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Why the answer is D, and why the others tempt you.
Pepsin works in the highly acidic environment created by hydrochloric acid in gastric juice, with an optimum around pH 2. Trypsin in the small intestine has an optimum near pH 8 to 9.
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