The pH optimum is an important factor in digestive enzyme activity because ________.
A. differences in pH in the digestive tract reflect which substrates are broken down at each location
B. enzyme activity is lowest within this range, preventing substrates from being broken down too quickly
C. it must reflect the pH of the blood in order for substrates to be safely absorbed
D. it must be higher than the body fluid in which the enzyme is found in order to be effective
Answer: A
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