A-LevelBiologyEnzymesMay/June 2022Paper 3 Q122 Marks
Plant tissues contain the enzyme catalase which catalyses the breakdown of hydrogen peroxide into oxygen gas and water. Ascorbic acid acts as an inhibitor of catalase. You will investigate the effect of changing ascorbic acid concentration on catalase inhibition. You are provided with the materials shown in Table 1.1. Table 1.1 labelled contents hazard volume/cm³ H hydrogen peroxide solution harmful irritant 50 W distilled water none 50 A 1 mol dm-3 ascorbic acid solution irritant 10 If H or A comes into contact with your skin, wash off immediately under cold water. It is recommended that you wear suitable eye protection. You are also provided with five cylinders of potato tissue, labelled P.
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