A-LevelBiologyBiological moleculesOct/Nov 2019Paper 1 Q71 Mark
A student carried out four tests for biological molecules on a solution. The results are shown in the table. test for biological molecules: iodine | observation: orange-brown test for biological molecules: biuret | observation: purple test for biological molecules: Benedict's | observation: orange test for biological molecules: emulsion | observation: clear Which three molecules may be present in this solution?
Aglucose, starch, globin
Bglobin, glucose, collagen
Cstarch, sucrose, collagen
Dsucrose, globin, collagen
✓ Correct Answer
The correct answer is B. 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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