May/June 2026 Paper 11

2026 · 40 questions · 40 parts · 40 marks

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8Biochemical Tests Laboratory MethodsMedium1 mark
A student was given a solution labelled U and asked to identify the biological molecule it contained.
The student added 2 cm of Benedict’s solution to 2 cm of U, heated the mixture in a water-bath at , and recorded that the mixture turned green.
Which biological molecule would give this result?
Option A of question 8, the structural formula of an amino acid (glycine): H2N-CH2-COOH, with an amine group, a central carbon bonded to two hydrogens, and a carboxyl group.
Option B of question 8, the structural formula of a three-carbon alcohol (glycerol) in which every carbon bears a hydroxyl group.
Option C of question 8, the structural formula of a saturated fatty acid with six carbons in total: a carboxyl (-COOH) head group and a five-carbon hydrocarbon tail ending in -CH3.
Option D of question 8, the structural formula of a hexose monosaccharide (a six-membered pyranose ring) with a CH2OH group and several hydroxyl groups around the ring.