A-LevelBiologyBiological moleculesFeb/Mar 2019Paper 1 Q111 Mark
The table compares three molecules, X, Y and Z, which contain the elements carbon, hydrogen and oxygen only. The percentage of carbon, hydrogen and oxygen atoms in each molecule is shown. [Table with molecule X, Y, Z and % carbon, % hydrogen, % oxygen values] Which row correctly identifies molecules X, Y and Z?
AX: monosaccharide, Y: disaccharide, Z: polysaccharide
BX: monosaccharide, Y: polysaccharide, Z: triglyceride
CX: polysaccharide, Y: triglyceride, Z: monosaccharide
DX: triglyceride, Y: monosaccharide, Z: polysaccharide
✓ 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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