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Cambridge IGCSE Combined Science practice

Paper 6 structured question: Enzymes

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Enzymes

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Paper 6Alternative to PracticalPractical2 marks

Analyzing enzyme activity data.

Results Table

Enzyme Activity Results

The following table shows the effect of pH on enzyme activity.

pHRate of Reaction (units)
46
512
620
725
810
93
  1. a

    Describe the trend in enzyme activity as pH changes.

    Aim for approximately 2 distinct marking points.

    [2]

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Paper 6 structured question: Enzymes

Paper 6Alternative to PracticalPractical1 marks

Method

Enzyme Activity Experiment

In this experiment, the effect of temperature on enzyme activity is investigated. A solution containing enzyme and substrate is prepared. The temperature is varied, and the rate of reaction is measured by the amount of product formed over time.

Temperature (°C)Rate of Reaction (units)
205
3010
4015
508
602
  1. a

    State the independent variable in this experiment.

    Aim for approximately 1 distinct marking point.

    [1]