O-LevelBiologyCell Biology5090/12 · May/June 2022 · Q91 Mark

The experiment shown was set up and left for 30 minutes. The membrane is permeable to sugar and water but not permeable to starch or protein. After 30 minutes, samples of the water in the beaker were tested with Benedict's reagent, biuret reagent and iodine solution. Which colours were obtained with these tests?

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Ablue, violet, blue-black

Bred, blue, brown

Cred, blue, blue-black

Dred, violet, brown

✓ Correct answer

B: red, blue, brown

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Topic: Cell Biology, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2022 Paper 1 Variant 2, question 9.

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