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Cambridge IGCSE Combined Science practice

Paper 6 structured question: Biological molecules

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Biological molecules

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Testing for biological macromolecules

Method

Testing for Starch

To test for starch, follow these steps: 1. Take a small sample of the substance. 2. Add a few drops of iodine solution to the sample. 3. Observe any color change.

  1. a

    Describe the importance of using a control sample in this test.

    Aim for approximately 2 distinct marking points.

    [2]

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Paper 6 structured question: Biological molecules

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Results Table

Benedict’s Test Results

Results of Benedict’s test on various samples are recorded in the table below.

SampleColor Change
Sample ABlue
Sample BGreen
Sample CBrick-red
Sample DYellow
  1. a

    Identify the sample that contains the highest concentration of reducing sugars.

    Aim for approximately 1 distinct marking point.

    [1]