A-LevelBiologyBiological molecules9700/12 · Feb/Mar 2019 · 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

B: X: monosaccharide, Y: polysaccharide, Z: triglyceride

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Topic: Biological molecules, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, Feb/Mar 2019 Paper 1 Variant 2, question 11.

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