May/June 2026 Paper 13

2026 · 40 questions · 40 parts · 40 marks

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9CarbohydratesHard1 mark
Four carbohydrates, W, X, Y and Z, occur naturally in plants. The diagram shows how enzymes P and Q digest disaccharides W and X, to produce monosaccharides Y and Z.
Diagram showing enzymes P and Q digesting disaccharides: disaccharide W is broken down by enzyme P into monosaccharide Y (one arrow); disaccharide X is broken down by enzyme Q into monosaccharide Y and monosaccharide Z (two arrows).
Which row is correct for W, X, Y and Z?
WXYZ
Anon-reducing sugarreducing sugarfructosereducing sugar
Breducing sugarnon-reducing sugarreducing sugarreducing sugar
Creducing sugarnon-reducing sugarreducing sugarnon-reducing sugar
Dreducing sugarnon-reducing sugarnon-reducing sugarfructose