Biological Molecules and Water
Question 1 of 5
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Biology Q & A Practice 1 of 5 A-Level exam-style exercises in this topic
Measurement or observationValue
Before hydrolysisBenedict: blue
After acid hydrolysis + neutralisationBenedict: brick-red
InferenceNon-reducing sugar initially
Figure 1: evidence supplied for the question

After acid hydrolysis and neutralisation, a sample changes Benedict solution from blue to brick-red. Before hydrolysis it remained blue. Which substance was most likely present initially?

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