A-LevelBiologyBiological moleculesFeb/Mar 2025Paper 1 Q111 Mark
Plant cell walls are strengthened by cellulose molecules that are arranged in several layers. Within each layer, the cellulose molecules are arranged in the same direction (parallel). Which row shows the bonds that hold adjacent cellulose molecules together within each layer and the arrangement of cellulose molecules in different layers?
Abonds that hold adjacent cellulose molecules together: glycosidic, arrangement of cellulose molecules in different layers: in different directions
Bbonds that hold adjacent cellulose molecules together: glycosidic, arrangement of cellulose molecules in different layers: parallel
Cbonds that hold adjacent cellulose molecules together: hydrogen, arrangement of cellulose molecules in different layers: in different directions
Dbonds that hold adjacent cellulose molecules together: hydrogen, arrangement of cellulose molecules in different layers: parallel
✓ Correct Answer
The correct answer is C. This question tests the candidate's understanding of biological molecules within the Biologysyllabus. The examiner's mark scheme requires...
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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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