A-LevelBiologyBiological molecules9700/12 · May/June 2023 · Q81 Mark

A student was provided with a solution of carbohydrate. They removed two samples from the solution and performed tests on each sample, as shown. [Figure 8.1] Which statement explains the results?

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ACondensation reactions occur in sample two to release reducing sugar.

BGlycosidic bonds in a polysaccharide have been broken to release reducing sugar.

CSample one shows that sucrose is present in the carbohydrate solution.

DThe change in colour to a yellow solution shows that glucose is present.

✓ Correct answer

B: Glycosidic bonds in a polysaccharide have been broken to release reducing sugar.

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Topic: Biological molecules, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, May/June 2023 Paper 1 Variant 2, question 8.

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