A-LevelBiologyBiological molecules9700/12 · Feb/Mar 2024 · Q71 Mark

Which flow chart outlining the test for non-reducing sugars is correct? [Figure 7.1]

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Aadd alkaline sodium hydrogencarbonate to sample → neutralise with dilute hydrochloric acid → add Benedict's solution and boil

Badd alkaline sodium hydrogencarbonate to sample → neutralise with dilute hydrochloric acid → add biuret solution and boil

Cboil sample with dilute hydrochloric acid → neutralise with sodium hydrogencarbonate → add Benedict's solution and boil

Dboil sample with dilute hydrochloric acid → neutralise with sodium hydrogencarbonate → add biuret solution and boil

✓ Correct answer

C: boil sample with dilute hydrochloric acid → neutralise with sodium hydrogencarbonate → add Benedict's solution and boil

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Topic: Biological molecules, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, Feb/Mar 2024 Paper 1 Variant 2, question 7.

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