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Practice problem

Enzyme Reaction Rates: pH — Effects & Examples

By Hannah Bonville
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The optimum pH values for three different enzymes (pepsin, salivary amylase, and pancreatic lipase) are shown in the graph below.

Pepsin operates in the stomach, while salivary amylase works in the mouth (in saliva). As the name suggests, pancreatic lipase functions in the pancreas.

Pepsin has the highest rate of reaction at low pH. Salivary amylase has highest rate at a higher pH. Pancreatic lipase works best at the highest pH.

Image source: Mcy jerry CC BY-SA 3.0 via Wikimedia Commons

What would happen to the rate of reaction for pancreatic lipase if it were transferred to the stomach?

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