The optimum pH for the enzyme arginase is which of the following?
Correct answer: C. 9.7
- A. 9.0
- B. 9.3
- C. 9.7
- D. 10
Explanation
The correct answer is 9.7 because this is the optimum pH for the enzyme arginase, where it exhibits maximum catalytic activity. Enzymes have specific pH ranges where they function most effectively, and any deviation from this range can lead to decreased activity. Options A (9.0) and B (9.3) are below the optimum pH, thus the enzyme activity is less than at 9.7. Option D (10) is above the optimum, indicating a decrease in enzyme activity beyond its peak performance at pH 9.7.
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Enzymes are biological catalysts that lower activation energy without being consumed, and their specificity is explained by the lock and key and induced fit models. Work includes the effects of temperature, pH and substrate concentration on reaction rate, plus competitive and non-competitive inhibition and how these differ.
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