In test tube 1 was: 5ml water, 0.5ml potato extract, 0.5ml PTU, 1ml catechol oxidase
In test tube 2 was: 5ml water, 0.5ml potato extract, 0.5ml PTU, 0.5ml water, 0.5ml catechol oxidase
In test tube 3 was: 5ml water, 0.5ml potato extract, 1ml water, 0.5 catechol oxidase
Why was catechol oxidase added last?