A-LevelBiologyBiological moleculesOct/Nov 2022Paper 1 Q61 Mark
The table shows the observations recorded from tests for biological molecules on four samples, A, B, C and D. Which conclusion is correct?
ABenedict's solution: blue, biuret reagent: blue, iodine solution: blue-black, conclusion: contains starch only
BBenedict's solution: blue, biuret reagent: purple, iodine solution: orange, conclusion: contains reducing sugar only
CBenedict's solution: green, biuret reagent: blue, iodine solution: orange, conclusion: contains reducing sugar and protein
DBenedict's solution: red, biuret reagent: blue, iodine solution: blue-black, conclusion: contains starch and protein
✓ Correct Answer
The correct answer is A. This question tests the candidate's understanding of biological molecules 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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