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

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Physiological pH refers to the pH range where most enzymes operate effectively. This range is typically around 7.4, which is very close to the pH of human blood. Maintaining this pH range is important for the proper functioning of enzymes and other biochemical processes in the body. Option A (5.4) and D (3.0) are both acidic and would be detrimental to enzyme activity. Option B (8.6) and E (9.0) are both basic and also not the optimal pH range for enzyme activity.

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