A-LevelBiologyEnzymesOct/Nov 2020Paper 1 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]
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
The correct answer is A. This question tests the candidate's understanding of enzymes within the Biologysyllabus. The examiner's mark scheme requires...
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
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