A-LevelBiologyEnzymes9700/12 · Oct/Nov 2020 · Q71 Mark
Diastase is an enzyme that breaks down starch into maltose. Maltose is a reducing sugar. A sample of starch is treated with boiled diastase and left for 15 minutes. Samples of the mixture are then tested with iodine solution and with Benedict's reagent. What are the results? [Figure 7.1]
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Aiodine solution: blue-black, Benedict's reagent: blue
Biodine solution: blue-black, Benedict's reagent: red
Ciodine solution: brown, Benedict's reagent: blue
Diodine solution: brown, Benedict's reagent: red
✓ Correct answer
A: iodine solution: blue-black, Benedict's reagent: blue
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