"Physiological pH", the pH for optimum activity for most enzymes, is a pH equal to

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Physiological pH, which is the pH at which most enzymes exhibit optimum activity, is around 7.4. This is the pH of human blood plasma and other bodily fluids. A pH of 3.0 (choice A) is acidic and would not be optimal for enzyme activity in most cases. A pH of 5.4 (choice B) is also acidic and would not be optimal for most enzymes. A pH of 8.6 (choice D) is basic and would not be optimal for most enzymes. A pH of 9.0 (choice E) is also basic and would not be optimal for most enzymes. Therefore, the best choice is C.

"Physiological PH", the PH for Optimum Activity for Most Enzymes