What is the optimal pH for the enzyme lactase?

Question

BlackTom AI · Accepted Answer

The question asks for the optimal pH for the enzyme lactase. Since the provided data does not include any answer options to analyze, I will first clarify the context and then discuss the concept in general terms.

Lactase is a brush-border bound enzyme in the small intestine that digests lactose into glucose and galactose. Enzymes have an optimum pH at which their catalytic activity is maximal; for digestive enzymes that operate in the small intestine, this optimum is typically near neutral to slightly acidic.

For lactase specifically, the intestinal environment where it functions is around pH 6 to 7. This means the enzyme is most active in a mildly acidic to neutral range typical of the small intestinal lumen near the duodenum and jejunum. It is uncommon for lactase to have peak activity at highly acidic (low pH, e.g., around pH 2) or highly basic (high pH, e.g., above pH 9) conditions, as such environments would denature many proteins or disrupt active site geometry.

If answer options were present, I would compare each numerical value to this general range. Values around 6–7 would be considered plausible, while values far outside this window would be unlikely to represent the true optimum. Without the options, the key takeaway is that lactase’s optimum pH is near neutral to slightly acidic, reflecting its function in the small intestine.

In summary, the concept to apply is: identify the pH that aligns with the small intestine’s environment and enzyme stability, then evaluate any given options against that inferred range. Since no options are provided here, the explanation centers on the typical physiological pH range for lactase activity rather than selecting a specific choice.

HUMNNTR 2410 SP2024 (37128) Nutrition Lab: Lactose Digestion, part 1

What is the optimal pH for the enzyme lactase?

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