An enzyme found in the blood would be expected to have maximum activity at a pH

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Most enzymes have an optimal pH at which they function best. For enzymes found in the blood (e.g. plasma, serum), the optimal pH is typically slightly above 7, around pH 7.4. This is because the blood pH is normally around 7.4 and enzymes have evolved to function optimally under physiological conditions. At a lower or higher pH, the enzyme activity decreases, and at extreme pH values, the enzyme denatures and loses its function completely.

An Enzyme Found in the Blood Would Be Expected to Have