Six test-tubes were set up at different pH values. They each contained the same quantity of starch and amylase in water. The table shows the time taken for the reaction to be completed in each test-tube. 1 3 5 7 9 11 pH time to be completed/s 95 64 42 35 66 At which pH does the amylase work best? B pH5 D PH11 A pH1 pH7 В D O A

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