A-LevelBiologyBiological molecules9700/12 · May/June 2025 · Q71 Mark
A sample of a solution of sucrose tested for reducing sugars remains blue, but when another sample of the same solution is tested for non-reducing sugars the solution turns red. What explains these results?
ADuring the non-reducing sugar test, an acid hydrolyses sucrose to glucose and fructose.
BDuring the non-reducing sugar test, sucrose molecules condense into polysaccharides.
CThe reducing sugar test converts sucrose into glucose and fructose.
DThe reducing sugar test hydrolyses monosaccharides to disaccharides.
✓ Correct answer
A: During the non-reducing sugar test, an acid hydrolyses sucrose to glucose and fructose.
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