May/June 2026 Paper 22

2026 · 40 questions · 40 parts · 40 marks

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8Maths Skills BiologyMedium1 mark
When amylase is added to a starch suspension, reducing sugars are produced. The graph shows the mass of reducing sugar produced over time when using three different types of amylase, P, Q and R. All other conditions are kept the same.
Graph of mass of reducing sugar / g (0 to 35) against time / s (0 to 90) for amylases P, Q and R, with a key: P (solid line) rises steeply and levels off at 30 g at about 30 s; Q (dashed line) rises less steeply and levels off at 30 g at about 50 s; R (dotted line) rises in a straight line to 30 g at 80 s
When the reaction was repeated using a different type of amylase, S, the rate of reaction was found to be 0.75 g / s. What is the correct order of rate of reaction for the different types of amylase from fastest to slowest?