Amylase, an enzyme that breaks down starch into sugars, typically has an optimal pH around 6.7 to 7.0. Beyond this range, both acidic and basic conditions can lead to denaturation of the enzyme.
Based on your question regarding the pH at which amylase becomes denatured, the most likely responses are between pH 5.5 and 8.5. Therefore, the correct choice would be:
5.5 and 8.5
This range represents conditions that are too acidic (5.5) and too basic (8.5) for the enzyme to function properly, leading to denaturation.